will go from right at 8. 600 Bore Nov 2, 2005 · Thanks for the info. DON'T ASSUME! Jun 13, 2009 · They are a great street head, and will work pretty well on everything from a mild cruiser to a hot street car. 72 with a few new replacement thrown in the mix. 11/1. Apr 17, 2010 · 1st possible head is a Dart iron eagle that has been ported - here is the description. Your question and the answer to why I typed all of this in response is a generality (rule) in engine building. 25 in the 270's. I put lots of highway miles on it at 2500 RPM,with a Comp solid roller cam,. 3 with a 75mm turbo for the wifes driver. BBC PRO1 20° 451cc CNC Cylinder Head – 1. Use of either style head requires that the correct pistons are used, otherwise BBC Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. 5:1. It is a service replacement head, also used on Mark IV crate engines. I chose the 049 heads because of the exhaust runner, had the bigger runner than the 781. ” Finally, if you are looking for a closed-chamber head, you will need to use an OE cast-iron unit. They have 2. If you have a 71 402 you probably have 820 heads, decent flowing for sure but they make for a low compression Open-chamber designs are larger and provide lower compression ratios, so require a much larger piston dome to achieve the same compression as a closed-chamber head. 88 valve 049 heads, It depends on the RPM range/cam specs. 300″ valves, just like their CNC siblings. 880" (mechanical). May 10, 2010 · The Pro Action and Pro Elite heads share a lot of specs with each other. 600 boreX4. Here you go 840 Rectangle port closed chamber 2. 25 Exhaust Valve Size-1. 9:1--8. 550 Assembled Dart PRO1 345cc Port Head: Maximum street or marine performance, bracket racing, heads up and super classes. Call for Availability. The stock 2. Canfield 310 heads are the perfect choice for 427-509… 360cc Intake Runners & 119cc Chambers 2. 30" intake / 1. 3 208 / 143. 060-inch overbore with a 4. The heads were used on Corvettes, Chevelles, and other special applications. Apr 12, 2005 · The 70 LS-6 used the 291 closed chamber head the 71 used an open chamber head. 310 bore no exhaust pipe. Heads have had ports cleaned, and gasket matched. check more around on the net, and check again. 2- open chamber and flat tops = get a blower or domed pistons. com. 050, 570/560 lift on 112 LS Improved Performance Over Chevy's Legendary LS6 Heads! Merlin 269cc Oval Port heads are excellent for most street-driven big-blocks up to 468ci. Exhaust port exits are raised . 045/. 88 inconel exhaust valves. In the aftermarket, most performance heads are aluminum rectangular port, open-chamber designs reminiscent of t stock 088 bbc rec-port iorn heads vs summit iron heads! let's talk about the dyno results when i tested a set of 088 bbc rec-port iorn head against a set of Chevrolet Performance Bow Tie Cylinder Heads are an ideal combination of street drivability and drag strip performance. Specializing in big block chevy ,small block chevy, big block ford and small block ford. 65@125mph 406 with home ported Dart 215 heads. hit the net and buy a book called how to hot rod big block chevys, printed in 70s and in the back will list all BBC PRO1 24° 345cc Cylinder Head – 1. To wit, I had one head that measured 1. MSRP: $ 4,481. Jul 23, 2012 · '67 Chevelle Malibu, Catalina Blue, 540 inch Rat, Air Flow Reasearch 290 CNC Heads heads, Custom Hyd Roller, . These heads are fresh from the machine shop and need nothing. They were used on a supercharged jet boat. 707 exhaust 109 LSA),Brodix single plane intake for a 4500 carb, Holley 1050 cfm dominator model # 9375, 2 inch primary Mar 27, 2006 · my biggest question is how you guys think these heads will do with my setup?car is a 1977 camaro,3500 race weight 4000 stall 28" tall ET Drags 4. Jump to Latest I've got ported 063s on a 427 using 219/188 valves and a solid f/t cam, can't remember the exact specs. Jan 29, 2009 · 1- yes they are some of the best flowing oval factory heads. 2 to 9. Tryin to save some Mar 10, 2021 · Looking through the GM catalog from 1989 it says Part Number 14096188 with a casting number of 6272990. 78%. 1488 heads work well with our PCE349. 3- yes, Forged and the lighter the better. May 2, 2017 · I had a pair of 049 Heads Reworked years back. Original skin/int. ProComp Part number PC3021. Big-block Chevy factory heads are offered in aluminum and cast iron, with either open or closed combustion chambers, and with oval or rectangular intake ports. 2 to almost 9. 4L/454 Chevy big block Mark IV Cylinder Heads Oval Intake Port Shape and get Free Shipping on Orders Over $109 at Summit Racing! May 5, 2008 · I'm confused. It also is 118cc open chamber head. Aluminum performance cylinder head 315-cc rectangular intake ports Cometic MLS (Multi Layered Steel) Head Gaskets (. that was decked. And like was said, exhaust valves are no gain. 88 exhaust: Casting # Years: CID: Chamber: HP/RPO/Comments: 3904392: 1967: 427 Nov 14, 2016 · I was selling a lot of 781's for a while and with 2. The BRODIX -4 and -5 valve angles have been rolled 2° from stock to produce more torque and lesschamber volume. He has a 6500+ rpm cam mated up with a set of 5500 rpm heads. You take your peak flow rate at the highest valve lift your cam produces (I doubt if your cam can pick the valves up into the 0. Sale! BBC PRO1 20° 440cc Cylinder Head – 1. The Pro Action BBC heads are available with either 320cc or 360cc intake runners, with the 320’s set up for 2. 2. These are 320cc Rect. Nov 30, 2008 · I would do more checking around on the numbers, ls7 heads are 627 2990 G M 1T block 14015445. This head would best work on pump gas 396ci to 502ci motors. I did a search but didn't find anything BBC Cylinder Head Casting Numbers: RECTANGULAR PORT - Valve size 2. 0:1 460" engine. Paul To install our BBC heads on Mark V blocks, you will need to use our SM5233L and SM5233R Elite Series MLS head gaskets. The 026 head is a LS6 rectangle head. 77 valves, or should I stay with 2. 88 Exhaust Valves installed. 21 Windsor Jr. 75 @ 116 mph in the 1/8 mile consistently. 2-137 107. Oct 12, 2014 · BBC Heads 188/990 NICE. 22 Main Caps 23 ARP Fasteners 23 Cylinder Heads Menu Toggle. I don't know about the runner sizes on those heads but they are the large oval type. CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. Jul 1, 2013 · C3 Tech/Performance - Will '990' heads wake up my low compression 454? - Ive got a low compression 454 (1972). 88 valve 049's. off the front of the car. 19 intake/1. 300" IN. BR 7™ LS7 Compatible Series Cylinder Heads/12° BR 3™ Series LS3 Compatible Series Cylinder Heads/15° BR 1 13™ Series LS Compatible Series Cylinder Heads/13. 36 28 year owner o 68 Camaro Vert 327 project, just about done the last 6-7 years, LOL Dec 31, 2007 · I finally got around to getting my "spare" set of big block heads out of hiding. 8cc. Replace with aftermkt stainless. seats done with 3 angle valve job and new guide liners installed with a set of "h. 1. 25-inch stroker crank. 19 intake valves tend to be very heavy. The 291 is the 1970 Rectangle Port Closed Chamber Head, the 292 head he has is a open chamber oval port from the early 70's. accueil engine code. Chevelle to a best of 10. 850" lift. It is very hard to control a 3/8" stem 2. 050, Lemons Headers, Holley Multiport Fuel Injection, TCI 6X 6Speed Automatic, 12 bolt Posi Eaton TruTrac, 3:31 Richmond Gears, front and rear power disc brakes, Global West Suspension, etc. 6 302 / 226 Talk to Chris Straub about the cam. 1:1 of measured, rated at 8. Both are presently stock, no porting but have been cleaned and maged. Jan 18, 2018 · Other than very high-end race heads, most big-block Chevy heads have chambers around 119 to 120cc, so the choice is more one of piston design for street/strip engines. For the BP PB 1803, BRODIX contacted the best head porters in the business to incorporate our porting design into a 100% CNC ported masterpiece. The Pro Action heads come in a 320cc and 360cc intake runner. Find many great new & used options and get the best deals for BBC GM 14096188 Rectangle Port Bare Cast Iron Cylinder Heads Pair at the best online prices at eBay! Free shipping for many products! Jul 21, 2008 · The 990 heads were the heads installed on crate motors and in cars, while the 188 heads were the 'service replacements'. Dec 30, 2009 · put a set of 820 heads on a 427, 11 and ahalf compression, 219, 188 exhaust, actually had to grind down in the middle a little bit, pistons were touching, heads ended up with 132 cc:s, motor ran like a banchee, in a 18 ft rogers bubble hull, turning over 10 grand coming out of the hole, never blew, judson masingale in houston, did the machine work, i did the porting, wish i could find that Mar 1, 2008 · Among the specs we list for each head is the intake port cross-sectional area. These are 119 cc. 2 114 106 86. 10 sec. Introduced in the fall of 1965 as a 1966 engine RPO, the 425 horsepower 427 not only saw service in the Corvette; it was also used (optionally, of course) in full-size Chevys and in later years, Camaros and Chevelles. 19 intake valve at high rpm. these heads have been great for that, but now i going to go through it and lower the comp a little (after market heads w/ a larger cc) and a smaller cam im looking more for a 2500 to 6500 power range to replace the 327 in my 66 chevelle for more of a cruiser than a racer any one with a good 427 Aug 4, 2007 · I was initially planning buying some Iron head 781's or 049's but after purchacing the heads, larger valves, port work and labor to be adequate these might be a nice alternative. 800" range), and double it. 240 to low . The 049 castings are on a 9. my motor now has a solid roller w/ a power range of 4000 to 8000rpm. 5 with no other changes. 75:1 433" engine. Port BBC Heads with 115cc Open Chambers. Int Long Short Exhaust. 051 Thickness) Each: $125: Cometic MLS (Multi Layered Steel) Head Gaskets (. Feb 13, 2009 · These have chambers of approx 95cc, regular BBC 2. 015 oversize heads were installed. Over 7,000 RPM, 540+ cubic inches. Just pick the right cam and intake. The Sniper series consists of all our 24 degree, conventional port BBC products which include intake manifolds, cylinder heads and cast valve covers. ratio with the 375 and 425 pistons. May 18, 2010 · These heads have the largest, as cast, GM production iron head ports. Also remember we lost about 65 lbs. They sold crate LS-6s that they lowered the compression on because of the bad gas with 188 open chamber heads. 250 and exhaust valves that measure 1. I know that they're not from the same engine originally since the date codes are so far apart, but I am wondering what they're worth. 88's and port blending, or even close? And would stock 188's have decent street manners in a mild 454 or 468? Oct 16, 2008 · I love those heads, 990/188/077/088's on gen-5-6's. So we dusted that one down an additional . Jul 18, 2012 · A common stroker displacement, our 496 was the result of combining a 0. Capable of making up to 1000 horsepower, Pro Action BBC Jan 25, 2010 · Mark, I don't mean to hijack your thread, but they are the "088" heads, not the "188" heads. 1-65 60. Too bad there so damn heavy. Know a guy with a set of 049's with about 200 miles on them. 600" max lift valve springs, and steel retainers. Jan 30, 2010 · I just flowed a 840 plus some others. 5:1 468 with cleaned up 2. Available in 3 intake port options (290cc, 320cc 370cc) the Pro-File Sep 27, 2008 · Head flow BBC Open Chamber Large Oval Port #049 . 650 Assembled 4. 030 pistons. I have a set of 3999241 in stock form. Producer and Seller of aluminum aftermarket cylinder heads, intake manifolds and engine accessories. 7-5. Personally, I went with the 781's and had 2. 6 260 247 166 Aug 25, 2020 · L-29 461 BBC 11. For 1971-72 LS-5 engines, although different castings were used for each year, the cylinder heads were, essentially, the same. " 427 springs and new retainers and keepers and umbrella seals. With my Brodix RR rectangular port heads and a new custom ground solid What Are The Top ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads? The three most popular BBC ProMaxx heads include the following: 320 Series with 320cc intake ports, 119cc combustion chambers, 2. My desire is to end up somewhere close to 10-1 CR. 5 248 229 153. It is lacking a little May 8, 2005 · They don't say they are peanut port, and the intake ports look just as oval as my 781 heads. Closed combustion chambers were used with the first generation of L88 heads, and chamber size poured out at 106. The revolutionary PB 1803 cylinder heads from BRODIX feature oval intake ports, CNC combustion chambers, and use all standard components for the 18° Pro Stock head excluding the manifold. 700" of lift. Just a little harder to find hi-comp pistons for. 19 intake valves and 1. I am in the process of building a 427. More “pedestrian” engines (read passenger car and truck), received the oval-port cylinder heads. Lots of the heads out there are too big for a less-than-serious engine. They'll out-perform larger heads in many applications. 16@118mph 461 BBC 8:1 compression with junk peanut port heads Mar 31, 2018 · In a stock BBC head the exhaust port is the cork in the bottle. Flat Tappet Cam & Lifter Kit Lunati's Voodoo series of Hydraulic camshafts deliver more area under the curve than any other series of Hydraulic camshafts. 72-inches. 600 336 238 . Gasket #5828 Ultraseal gasket, mathces the ports really closely. dart iron eagle 308 cc heads they have been ported to a 316 cc runner and flow 370 at 700 lift and they have been flat milled to a 106 cc chamber . Nov 17, 2017 · Re: 088 BBC head flow data? Post by mag2555 » Mon Nov 20, 2017 11:50 am If I recall right without digging up my flow test sheets, the best stock intake on a 088 casting hit 325 cfm@ . May 18, 2007 · General Q & A - 188 heads on a 540? - Lets say I bought a pair of 540 Dart shortblocks, Gen IV style. 10s Engine Specs: 489 BBC 049 oval ports 10. I would say keep the 049s, sell the vette heads, and spend your 2k on something else for the car. 50 lobecenter 110 lift 630-650 with 1. 23@109 1. This cylinder head delivers great throttle response and power from 1500 to 6500 General Recommendations for AFR Cylinder Heads: Bar Codes - Please keep the bar code & paperwork shipped with your head, these contain all the specs for your heads when calling AFR. The casting number and the casting date on L6 and BBC heads will typically not be in close physical proximity to each other. The date code is irrelevant unless you’re really trying to re-create a piece that matches some original documents and sales dates. I think in most street applications, the 049's are going to stand up to the rectangular heads pretty well. Basicaly, you end up with a max raised port, thats about the same size, or a hair bigger, than a fully ported oval port head, but the port layout is much better. Pulling the valve cover, the heads say 14096188. I thought all tall deck heads were peanut port heads? Do these have any potential on a mild 9:1 454 1/2 ton truck engine that must run on 87 octane gas? (300-350 HP) Any info on these heads is greatly appreciated. The AFR heads had about 2 less cc's than the 990's so maybe a little of the et came from a slight increase in compression. Oct 2, 2008 · Pro Action Cast Iron 320cc Cylinder Head, 360cc BBC Cylinder Head Racing Head Service knocked one out with its Pro Action cast iron heads. 88 valves Nov 28, 2010 · What I'm trying to say is that: YES OEM Heads (Cast or Alu) are feasible for how you desire to Build and DIAL-IN an ENG - Believe me, GM progressed Specs better then either Ford & Mopar; YET, I have never been able to build one Better then the Other; so don't think a BBC Camaro Conquers All when a 1968 4 Cyl B21 Volvo will Wipe Your A** . For a combination that is unbeatable, pair the SNIPER Cylinder Head Sep 4, 2012 · Toss in the fact that cast-iron BBC heads weigh a metric ton, and the choice is a no brainer. 4 234 215 137. o. They are all put together with a fresh valve job and new seals. While all early cast-iron and all-aluminum heads used 3/4-inch-reach gasketed spark plugs, most iron heads made after 1969 utilize smaller, taper-seat spark plugs. This means more throttle response, quicker acceleration, more vacuum, better efficiency, combined with maximum horsepower and torque!Hydraulic. Jun 12, 2008 · im thinking about running the comp cam mother thumper cam. 5 295 / 203. Jun 22, 2007 · Merlin Cast Iron 269cc BBC Cylinder Head, Merlin III Cast Iron 320cc BBC Cylinder Head Specs: cast iron cylinder head material; combustion chamber volume 67cc; intake runner volume 170cc Buy BBC Big Block Chevy Aluminum Cylinder Heads Bare Casting 345cc Rectangle Port From Karl Kustoms, One Of The Largest Online Retailers Of Chevy Performance Parts In The USA. Jul 11, 2006 · 427 BBC, 215 heads, 2. 72 valves for the small bore Pro-Filer's, SNIPER, Big Block Chevy product line is designed with powerful, out-of-the-box concepts. 700 329 246 Jan 17, 2007 · The intakes are oval, right? They are good heads for a performance build, or stock, original engine. -----Procomp Motorsport's 3021 BIG BLOCK CHEVY, ASSEMBLED, Aluminum Cylinder Heads Musi Victor 24º CNC-Ported Cylinder Heads The only out-of-the-box head capable of 950+ HP from conventional big block port locations! Designed by 5-time Pro Street Champion Pat Musi, this version of the Victor 24° Cylinder Head has fully CNC'd chambers & ports. 73 gears 12. Put the tiny heads on and the CR jumps to 9:1. 250 stroke)Dart Big "M" 4 Bolt Race Prepped Block w/Splayed Caps, GM iron square port heads, solid roller camshaft (286@. Nov 9, 2012 · George Kettler o SOLD 8/2016 my beloved 1970 Elky 496. INTAKE GASKETS The PCE281. Not just more peak power, the Brodix heads swap increased torque production through the entire rev range, from 3,500 rpm through 6,500 rpm. Aluminum cylinder heads reduced the 427 big-block’s overall weight by 70 pounds compared to the iron head versions. com Apr 28, 2019 · OEM iron 188 Rectangle port heads, 4150 carb, ported Vic Jr intake, 13. SKU: 19776199. 600 Bore Chamber. They provide a broad power range with ample low-end torque, excellent throttle response, good mid-range torque and enough top-end power to beat your competitors to the finish line! The Dart Big Block Chevy Pro 1 Aluminum Heads were inspired by Dart's championship-winning Pro Stock designs and available with 310, 325, 345, or 355cc oval or rectangular port intake runners, big block Pro 1 aluminum cylinder heads deliver out-of-the-box airflow that smokes the competition! Aug 17, 2005 · for a complete rebuild of my 049 heads it cost me 315 bucks total. 25 and 1. The most prolific big-block powerhouse had to be the L72 engine option, which spawned several different variants as well. 74 60ft ***SOLD*** 1968 Camaro in progress stock 5. 7 rocker 800 Proform carb Aug 31, 2022 · The “Snowflake” Heads. @ . Feb 20, 2008 · As for the 088 heads compared to a set of 2. 1972 Nova 427 BBC ,TH400,3500 stall,9"rear 3. Feb 25, 2012 · 1966 closed chamber? 396/427 L34/35 heads, 325/360hp, Oval port, 260cc intake port volume, 98cc combustion chamber, 2. It's doubtful that anyone messed with the exhaust ports at all, if the rest of the head is untouched. Made in the USA! Canfield 310 Aluminum big block Chevrolet heads are considered one of the best bangs for your buck on the market. 19/188 valves (11/32 stem, no back cut on intake), good valve job and no blending or porting they would flow very similar numbers; In / ex. It's easy to get caught up in the numbers game with those published flow numbers. It has a cheap stroker kit with KB flat top pistons. Heads are in very good condition. Apr 2, 2009 · There's a lot to choosing a head, but AFA chambers go I would suggest going w/an open chamber head if using OEM. 88 valves. I was told by my machinist who builds a lot of engines that the head is real thin but I had already bought the heads. Some believe this engine makes 750HP! Aug 21, 2015 · Would you say the stock 188's, without blending, would be equivalent to 049's with 2. Jul 24, 2011 · According to the "Chevrolet SS Red Book", GM oval port head #6272292 was only listed as being used on 1972 402/454 model big block engines. I plan on goin aluminum heads at some point but if these will hold me over with out hurting me that would be good to. This NHRA-legal aluminum cylinder head is a replacement for the L88 Big-Block cylinder heads used on 1968-1971 Corvettes and 1969 Camaros. They can make decent compression with flat top pistons. These are great heads to pump up the CR on a 70s or 80s truck low compression 454. 30 intake valves in the 298 heads, 2. 290/840 closed chamber rect port can make great power to. The bigger valve diameter and bowl porting to go aong with it is probably 75 hP or a little more, the stock BBC head has a really poor short side turn in the intake port, and with the stock valve size there just isn;t the material there below the valve seat to cut the correct curve Nov 29, 2006 · Those are 66 Corvette heads !! Very valuable. 88 exhaust? I figure if I'm going to replace the head gaskets I might as well go aluminum, but it sounds like these heads are only worth around $400-$500. Would it be possible to install my rect 188 heads off my 454/420, new HYD flat tappet cam, intake, and larger oil pans? Would I still be able to use the 9022 Holley 800's or would I have to go to 850's or 1050 The SNIPER BBC Cylinder Head Series is a powerful, out-of-the-box, 24 degree conventional port cylinder head product line. They have never been hurt, no repairs, ever, and are ready to run. 800-inches of lift. 700 334 197 0. 00 For your consideration is a set of GM/BBC High Performance Heads Casting # 14096188 same as the 990 Heads, Large rectangle/square ports, Jul 23, 2015 · In addition to a huge weight savings (iron BBC heads should be abolished), the Brodix heads increased the power output from 631 hp and 578 lb-ft to 704 hp and 624 lb-ft of torque. 600 320 192 0. Chevrolet Big Block Cylinder Head Casting Numbers. 880″ exhaust valve seats, and May 6, 2012 · Here is list of all OEM oval port heads OVAL PORT - Valve size 2. Make it a condition of the sale that it pass magnafluxing. Rectangle port BBC heads do have a casting symbol on the end of the head (shown below). 250″ intake valves and the larger 360’s taking 2. 5:1 compression with the 063 heads. Dec 1, 2016 · After the break-in cycles, the tuning session included adjustments to jetting, timing, and even the oil level (very important). 500 320 215 . thanks for any help Jul 29, 2009 · The 049 heads have 255/119 cc port size runners, with 122cc combustion chambers. High Volume/Pressure Oil Pumps - If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption Dec 6, 2023 · Oval port BBC heads do not have an external casting symbol. 65%. Featuring high velocity, PRECISION As-Cast ports and optional CNC or AS-Cast Chambers The Sniper line can make some serious HP. o SOLD 6/2020 my 68 Vette 427/M-20/3. 100 73 71 . Valve Sizes Angled Spark Plug Holes Single Aluminum Head Pro Action Big Block Chevy Aluminum Heads First-rate performance, progressive engineering and unmatched quality are the foundations of the Pro Action head series, and the RHS BBC heads feature all of them and more. Sep 4, 2012 · 0. valves reground 2. 750" and maximum lift is . If a vehicle was ordered with as “high-performance” with a big block, that engine received rectangular-port heads. Feb 27, 2019 · Gene ACES 3112/Team Chevelle Gold #62 67 SS396, MJ467,M23Z, oem 12bolt. Call (855) 806-1147 or Order Online! Feb 1, 2014 · Lunati BBC Voodoo 276/284 Hyd. 050 ex . 400 282 188 . They need to have the rocker stud bosses tapped to 7/16 for regular BBC guide plates. May 20, 2015 · When this new cylinder-head design was established, Chevrolet then decided to create two distinct versions of the cylinder head. 600 - 276/188/204 Now, my CFE/BMF's 310cc intake runner, 150cc exhaust runner, 2. 06 and 1. It was used on the '67-'69 396-375's and 427-425's and gives approx. 88" exhaust valves, 7/16" rocker arm studs, . The intake ports are just about 2 ¾” tall and 1 ¾” wide. Feb 25, 2014 · BBC Heads, 781's vs 215's. Also bronze guides and hard seats. Sep 12, 2008 · I am on my second set of rectangular port heads on my 454. 880" EX. @ 0. 25 Your Price: $ 4,384. 19-inches and exhausts were 1. 260. most of the time there not right. 72 INT EX. _____ Feb 20, 2019 · The Gen V and VI heads used a non-adjustable rocker arm with 3/8-inch studs. 250 duration @ . 88 exhaust accueil engine code. 19/1. 050 33 34 . Features 100% CNC machined intake runners , exhaust ports and combustion chambers; capable of flowing 375 CFM at 0. they heads made 790 hp with a 750 lift cam heads and valves they r a 2. The -4 and -5 have a raised intake port design (approximately . RECTANGULAR PORT - Valve size 2. I have T&D 1 piece intake stand, also. Both heads feature a 119cc combustion chamber with intake valves (with hardened seats) that measure 2. His 11:1 468 powered his almost 3900 lb. 19/188 valve size and give them breathing room Jun 25, 2009 · You'd be hard pressed to find a n/a BBC topped with factory cast iron heads that made more power than Ed Bigley's. 06/1. Choosing big-block cylinder heads depends entirely on the application. The motor is a 491" BBC. The specs are 240/246 @ . 55s track times soon to come. It's really a toss up on which ones to use as the 049's flow more but the 781's will give a little more compression. A dome's usually required to get decent CR. In the neighborhood of 325 intake runners. Anyhow my heads had 2. Sep 16, 2006 · 12-1 compression 565 BBC Shafiroff short block(4. 11:1 comp. 1007 rectangle port gaskets. 1 66 59 45. 188. Chevy Factory BB Heads had a bad exhaust design to start. 6-5. The only differences in the engines other than the heads were the compression and cubic inches. Some customers brought some heads in to flow and I thought you guys might find the numbers entertaining. 050 range. As I was told the 188 is a replacement for a 990 head that was the head on a lot of over the counter LS7's. That even makes his problem worse, unless he has a lot of dome on those pistons, his compression will be pretty low in conjuction with that cam. The casting number is 3917215, and the date codes are F4-8 (June 4, 1968) and K30-7 (November 30, 1967). dont have the specs in hand at the moment. See full list on cartechbooks. Before these, I had the GM Bowtie head, conventional port location. Jun 22, 2016 · L88 Aluminum cylinder heads. Chevrolet. 88 exhausts put in. Intake valves measured 2. The Edelbrock #60455 Performer RPM O-Port cylinder head is designed for Big-Block Chevy applications. front tab T0118 XCH. 19 stainless intake valves. With the stock dome for 325hp 396 they were advertised at 9 to 1 compression ratio with the 265/396 and maybe the 310hp/402 that were in pickup Aug 13, 2020 · With the cam already broken-in, you don;t have to worry about the spring uisue, so that's a plus for you. 761 lift intake . The whys are the availability (heads and pistons) as well as the open chambered heads shroud the valves less- results in better flow. 4 265 / 175. 79/gallon race fuel go 11 to 1 or more. 050 intake/292@. The Chevy Big Block’s Performance Heads have very large Intake runners with rectangular-shaped ports. 200 152 120 . 88 valves with some port work, 60212 Lunati Hyd Roller, 3310 Holley 750, Performer RPM intake, TH350 with shift kit, 3. . I have a friend with a 9. chamber and will direct bolt to Mark V and Oct 3, 2005 · A stock set of 781/049's with the stock valve size is will flow around 265 cfm @. This head sacrifices low lift efficiency just a little for its high lift flow numbers up around 0. Our competitors offer a similarversion of these heads, but they have larger Mar 6, 2013 · Any one use a set before? Does the clearance around exhaust valve hurt or help these heads? Use on 4. This is a pristine pair of Big Block Chevy 188 square port cylinder heads, the 188's are identical to the 990's just a later casting. Nov 22, 2010 · According to the book, Chevrolet Big Block V-8 Interchange Manual, by Tom Currao The #346236 peanut port head shows 225cc intake port volume, and 113cc Aug 19, 2011 · 336781's are 1975 low performance (smog) heads used in the 454/215. Port shape, chamber design, and valve size […] Jul 10, 2019 · L72, L71 & L89 427 . 9:1 CR, VP Q16 fuel, custom Howards SR cam, 802hp @ 7k, 660lbs @ 5300. AFR's 335cc BBC Enforcer cylinder heads feature their Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners, and combustion chambers that allow for extremely accurate and repeatable port location/performance. 3 178 173 115. 65 @117. Nov 16, 2009 · BBC rect port #188 casting heads. 88 exhaust Oct 27, 2002 · If you don't mind putting 3. Aluminum heads possess two additional threaded bosses under the intake runners. Top End Combos; LS Compatible Heads Menu Toggle. Alternatively, you can use Victor Reinz # 4918(R) & #4923(L) head gaskets on Mark V blocks with our heads. Jan 7, 2012 · 67 chevelle 406 10-1 200cc dart iron heads lunati hyd flatt tappet 480 230 cam perf rpm 750 holley vac sec. When I was a kid, my dad had a set of old Comp Eliminator heads that had 2. I'd use the Mr. 7 to 98 cc's and putting them on a stock 454 P/U engine, it's CR. I'm using L2300F - . 3-195 137 Sep 17, 2009 · This set of heads gave me about 4 tenths and 4mph improvement over a set of totally stock untouched 781 castings that I had on a 9. 007" to get the two heads much closer in chamber size. 125 bore Thinking about installing 2. The real 450HP LS-6 had 291 closed chamber heads. Jun 26, 2009 · I'm familiar with the BBF heads which on the average, most can get the non-cobra jet cylinder heads to go 340 cfm "relatively" easily, what about the BBC cylinder heads? With the BBC, what's considered average that most head porters can expect to see out them with larger valves and full port work? I found 2 threads here that the individuals who Our medium sized 290cc oval port cylinder head is recommended for moderate street or street/strip big block chevys with displacements up to 509 cubic inches, operating at or below 6500 RPM. 5° Small Block Chevrolet Compatible Heads Menu Toggle. Euclidians be damned—round is the new square! See All 10 Photos. 188 heads are not worth a lot of money there are just too many better heads made today. 5 points and not all open chamber heads work correctly with closed chamber pistons, most do but not all I would stick with the 215`s and open them up to the larger 2. 94 valves in them. 3200 edge stall 3. 88 exhaust Jan 14, 2009 · The RPM head features a large-volume oval port with a unique rectangular oval-port entry, or "roval" for short. 3 to 1 CR!! Oct 8, 2019 · I agree, if you are going to put bigger valves in a BBC head, go for an 11/32. 72 exhaust Casting Years CID Chamber CC HP/RPO/Comments 330864 1970-81 366/427/454 Open . 81 or 2. i heard it on the web page and its just the sound im looking for. Speed Works has teamed up with Wilkes Performance to bring you these Big Block Chevy Canfield Heads. 1973 and 1974 LS-4 engines used cylinder heads specific to each year which were different for each year. But you should be able to get to the 450hp level with them being pretty much stock. Casting dates were included on each part. 72 valves. What is the true cc of the 049 bbc heads? I read every thing from 113cc to 119cc to 122cc. . 88 exhaust Dec 21, 2022 · The 298 heads flow quite a bit better since they're a full CNC head. Particularly if they've been dusted in the past. Yours were cast on October 6th, 1974 and were used in the 1975 full size or Corvette. Have a new set of valves for either, Ferreas and Manleys 2. Consider the stock chamber is 119cc, perhaps a mite larger, and CR is 7. If you think this engine itself is a rarity, our research found that only 188 of the LS6 454 engines were offered in 1971 for the Corvette with these aluminum Jan 22, 2011 · I'm building a 496 BBC and have 2 sets of heads, 781 ovals and 990 rects. 88 Intake port vol-267 cc Chamber Volume-118 cc Lift In EX . 050. 2 141 / 109. 19 or 2. 880. cpmotorworks. BBC oval port 063 closed chamber as close to stock as I can imagine, stock valves sizes no back cuts. Bored 30 over with a 'mild cam'. 600 Bore Chamber-Add to cart Compare. solid roller cam 255/265 dur. If restoration is your goal, your choice is limited to locating the correct casting for your original engine. Aug 3, 2013 · They have the same runner size as the 049/781 heads and are rated at 101cc`s. John Broader horsepower and torque curve than other BBC spreadport cylinder heads; More potential horsepower per dollar than any other BBC cylinder head; Provides the next level of BBC performance for nitrous, blown or naturally aspirated applications; Available Exclusively from Reher-Morrison! This aluminum head can only be purchased from Reher Sep 16, 2006 · It ran 5. AFR 335cc Enforcer BBC Cylinder Heads. & 1. Aug 5, 2012 · Ouch, my mistake. Nobody makes an aftermarket closed-chamber head. 640 lift May 23, 2004 · A tripower! Actually a GM #163 or rpm is fine. They respond well to bigger valves and basic head work. 040/. 10@118mph 9-30-22 10. I hav'nt seen any flow numbers on this particular #292 BBC head but I doubt there would be much difference between the GM large oval port/open chamber head #820 of 1971 Apr 23, 2010 · Brand new in box Pro Comp Aluminum Heads, complete with Valves, Springs, etc. Below is a test of a very mild application with the factory rectangular heads compared to a set of 2. Dec 18, 2006 · Hello I just got some bbc 188 casting heads and was just wondering what kind of plugs do these use. On a flat top 454 you will see about 9. They're simply OK heads, with a real need to raise the exhasut floor. 332. The BB-1 rectangular port head has an as-cast 280cc intake port and is available with a 110cc, 115cc or 119cc combustion chamber, but may be angle milled to 108cc or angle machined to 98cc. Does anyone have or have seen any flow numbers for the heads? Curious what kind of power they will support. 630 in. 25 intake and a 1. Both Pro Action heads have 1. We put a set of the fully CNC AFR 315 heads and then ran 5. Nov 26, 2015 · Got these heads on my 555 I purchased and can't really find any info on em other than they are 116cc ls6 replacement heads. 645 ex. Flowed on a 4. They are the Rectangle port heads for the Gen V. An aluminum-headed big-block was king of the hill in a ’70s muscle car, and this engine is equipped with the original Winters aluminum “snowflake” heads. Vortec 062's 406 w/hyd. The ports are very similar to the 990's that I have sitting here. The Edelbrock #60455 Performer RPM head is perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. With our tuning finally dialed in, the ProMaxx BBC heads demonstrated their worth on the 572 stroker by producing peak numbers of 850 hp at 6,800 rpm and 719 lb-ft of torque at 5,500 rpm. this can vary so you`ll need to cc them. See our website @ www. 300 228 162 . 700" lift, the Exh low topped out at 200 cfm@ . 88 valve 781's that made 560 hp and 560 tq with an hyd roller cam in the high . Speed Pro's tend to be cheaper and heavy, SRP are a little more expensive, but the lighter weight takes stress off the rods and rod bolts. 5:1 comp. 400”) allowing theshort-turn radius a better air flow angle without sacrificing velocity. The factory heads had worn guides and seats, so valves with an oversize stem and 0. 14/1. IK® Series Cylinder Heads/23° Race-Rite® Small Apr 13, 2004 · PDQ, and not only one of a set of heads. GM did some wierd shit back in the day. 650 lift & 243 dur. this long block i bought in early 70s and still in the crate waiting for the right boat. It started as a LS-6 crate motor with the 188 cast iron heads,it never "coughed or sputtered" below 3000 RPM. Feb 6, 2007 · 5) 1970 LS-5 cylinder heads were unique to that year. Ive never figured out why guys get all giddy over using vortec heads on a SBC and then dismiss the peanut port heads on a BBC, if you put vortecs that flow about 230cfm, on a 383 or 400 sbc, with a matching compression and cam timing, you generally can build a real mid rpm torque monster, but guys don,t seem to realize mildly reworked peanut port heads easily flow 260 cfm, and on a 396-427 Nov 14, 2013 · A proper valve job, some fairly easy work with a grinder below the valves (after lots of research) can make the heads flow more than your 402 can reasonably use. The head faces were also milled to more closely match the chamber volume of the TFS heads (114 cc). and comp cams triple valve springs good for . the diff seems minimal for Alum. Merlin IV BBC 10 Merlin III BBC 11 Merlin Gen VI BBC 12 8. They have Isky solid lifter valve springs, Cam was . 5cc on average bigger. 625 Assembled 4. 005-. BBC PRO1 20° 440cc Cylinder Head – 1. I have manufacturers flow numbers if you want them but you can get them off of Procomp's website. 500 289 188 0. A representative head would be the commonly known 049. 675 lift, 234, 244 at . cam and stock rocker arms 11. Race-Inspired Head That Works with Most Standard Big-Block Chevy Components! 26°/4° Intake & 17°/4° Exhaust Valve Angles. 07 @ 130 and the heads were #215 casting oval ports. 060/. 16@118mph 461 BBC 8:1 compression with junk peanut port heads BBC Big Block Chevy High Performance Heads 188 pair $650. 25/1. They are supposed to be open chamber heads. I had the bowls under the valve opened up as far as they could go. Jan 11, 2013 · The 990 head is a 118cc open chamber rectangle head. Our BBC rotating assembly came from the experts at Scat Enterprises. 19 intake, 1. 1 Liter BBC 13 Man O’War SBF 14 Cylinder Heads S/R SBC 15 S/R Torquer SBC 16 Sportsman II SBC 17 Motown 220 SBC 18 Merlin BBC 19 Merlin BBC 20 Windsor Sr. (dont know specs) and all the other go fast stuff (carb, exhaust, intake, etc) I found a set of 990 heads locally any they seem to be in my budget (guy wants 850 for em) With Oct 15, 2014 · The 3919840 cyl head is a 107cc, closed chamber, rectangular port head. When larger engines (454 to 540ci) require added flow, choose the Merlin Rectangle Port cylinder heads. the valves are ss swirl polish manley severe duty valves. Specs are below. 55 gears 12 bolt Sep 25, 2020 · L-29 461 BBC 11. Jan 14, 2014 · 063 BBC heads. Mar 6, 2008 · Fwiw, my early large oval closed chamber -206 heads should cc down around 96. We measured each of the five heads in the same basic place in the intake port to determine the smallest cross Aluminum aftermarket cylinder heads offer tremendous airflow potential to maximize power potential. They are awesome heads and the only difference over the 049/781 heads is they are closed chamber. 700 lift. 91. 066 Thickness) Each: $145: Intake Gaskets - Many Types & Thicknesses Available : From: $15: Rubberized Cork Valve Cover Gaskets : From: $15: Blue Silicone Rubber/Steel Core Valve Cover Gaskets : From: $49 Find 1986 CHEVROLET 7. Nov 25, 2023 · Mark, I have the Dart 355 CNC head and noticed the thin area above the intake ports. The thing is, I don't know that I need 298cc heads on 433 cubic inches. 06 intake, 1. 19 1. They are from the late 60's, a closed chamber design. 19 Intake, 1. 800 335 201 set of well ported 049 heads Intake Valve Size-2. Chevy only installed these heads on their high-output performance engines. The seats were cut to a three-angle performance spec with a fourth-angle bottom cut at 75 degrees. Same head, just a different part number. A pair on ebay sold for $1700 and another set for over 2000 !! You should be able to make decent power with them, but the 049s are great heads too. If you spent $500-700 plus on the Irons head. Do they use the 5/8 style plug without a gasket or do they require the 13/16 style with the aluminum gasket. Jul 2, 2007 · Running the open chamber heads will lower the compression ratio by around 1-1. Nov 27, 2008 · If it was a rectangel 088, 188 or 990, then full porting, with the epoxy makes them work really well on an application like yours. mbmirq izhcv rzlwph mjpkek tyy pwk saifey avcixvlb muhkro qpxx