Bbc 427 aluminum heads

Bbc 427 aluminum heads

Bbc 427 aluminum heads. 88" Valves. (85) Get Results. 90º V-6 heads BRODIX has to offer include 194 cc, 210 cc, and a 221 cc intake port sizes. Cylinder Head, Marine-Duty Performer RPM 454, Assembled, Aluminum, Black Anodized, 118cc Chamber, 315cc Intake Runner, Chevy, Big Block, Each. Manufactured from 356-T6 aluminum. 10. As with any Additional Options: Intake Valve Upgrade. 435-3603. 19/1. When the day comes to go bigger, I will most likely buy aluminum heads. Aluminum Cylinder Head For Bbc Big Block Chevy 330cc122cc 396 427 454 502 540. 1:1 May 14, 2006 · New NA 496 BBC 10. or Best Offer. FWIW. 88-inch valves. Option 2: Our small port, high velocity 265cc cylinder heads are a cost effective choice compared to re-worked factory big block chevy cylinder heads. 065-inch-thick): 3891521 PB 5000 Series/15°. Jason. GM Production of the Chevy Big Block engine began in 1958 with the Mark I W Series and ended with the Gen VII in 2009. Replacement head for P/N 14011076. Home. This head would be best fitted on a big-inch street big block using a large cam that could take advantage of this head’s high lift flow potential. CHEVROLET 7. Canfield 310 Aluminum big block Chevrolet heads are considered one of the best bangs for your buck on the market. I think aftermarket aluminum heads are going to be better for me anyway. Dec 19, 2018 · All of the original tooling was used, so the Anniversary Edition 427 has oval port big-block heads and the forged rotating assembly. The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend; this torque monster is capable of Mar 23, 2017 · Drivers side rear of the block on the top of the bell housing flange. Jun 6, 2022 · On Westech's Superflow 902 dyno the 427 big-block was fitted with a set of 2. $809. 030 over, friend of a friend so I "trust" his claim, but who really knows, mild cam, ran strong shifting at 6,600rpm, 2 bolt main, holley 750 double pumper with the horn milled off, edelbrock Jan 7, 2024 · These are large oval port cylinder heads with open style 115cc combustion chambers and 300cc intake runners. Valve sizes are 2. Roller Rocker Arms - 555-209906 ml. Chevrolet Big Block Heads were offered in many different variations within their 51 years of production. Actual Torque (lb-ft) 470 lb-ft @ 5,200 rpm. . $1,104. Buy It Now. Crate Engines, Pro Series Chevy LS 427 C. Strictly for reference. Ive done some reading and they seem to be alright heads but my I had them checked over and my machine shop said they would recommend having new guides and a vavle job done and they quoted me $400-600. They come fully assembled with the identical components found in ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads. (45) In Stock, Including at a Supplier. D. 94 valves done by airflow research. The current “bad-boy” Bowtie race head is PN 12363425 (casting number 14044861), a bare head with 380-cc intakes and valve seats for 2. These heads are available in straight or angled spark plug versions. JOE SHERMAN RACING. You could sell the heads (if not doctored) and have a very nice European vacation. (Those fundamentally different from basic L-88 engine package) Gasket, Cylinder Head: 3935458. These heads appears to be ready to bolt on, but please check them before using. FEATURES INCLUDE: SBC 421/427/434 Assemblies BBC CHEVY 496-572 AFR ENFORCER 335cc ALUMINUM HEADS ASSEMBLED 272-BBC-ENFORCER. 0L/427 Cylinder Heads - Free Shipping on Orders Over $109 at Summit Racing. Dec 4, 2009 · Here is the description: You are bidding on a part of GM Aluminum Heads, part # 3946074. 800 exhaust valves. Goin for that old school look this go around. Medium Strength Blue Bolt Crate Engines, Pro Series Chevy LS 427 C. #4 · Mar 12, 2009. Todds was a 414 long rod, vicjr, 10:1cr XR286 billet solid roller, 781 ovals, ran a best of 10. 98. seperformance5 (17,014) 100%. Sep 1, 2009 · Choosing Aftermarket BBC Cylinder Heads for Street/Strip Applications. Know a guy with a set of 049's with about 200 miles on them. In fact, AFR now has a 290 oval port head that will out-flow 074's. 62. My question was are the torque specs. By Randy Bolig February 20, 2019. Under the valve covers on top of one of the intake runners right next to the rocker stud. This budget friendly head is perfect for your 509 to 540 Cubic Inch operating below 6500 RPM. The BB-1 is designed for a 396-502ci Find CHEVROLET 7. Dec 21, 2018 · All of the original tooling was used, so the Anniversary Edition 427 has oval port big-block heads and the forged rotating assembly. Mar 31, 2018 · SuperNovaSS. 880" EX. 427 BBC bored . 25" Intake/1. Feb 25, 2012 · BBC Heads #3872702 looking to go aluminum. Chevrolet Big Block Mark IV block with Late Bowtie aluminum, Iron Dart, Pro-1, Pro Top Line, & World Products iron heads, 12pt, ARP Stainless. The abundance of cubic inches is staggering, and the canted-valve cylinder heads are largely responsible since they flow a seriously large amount of air. Canfield 310 heads are the perfect choice for 427-509 cu in engines. May 4, 2023 · 460 lb-ft @ 4,000 rpm. 250. 880 inches. $1,699. Hi all need some info on Big block gm heads casting numbers 3946074 aluminum rectangular open chamber heads used on L88. Available $1,817. When it comes to making power, big-block Chevys are known for having an easy time making a lot of it. 300" IN. The trick flows seem to be a little nicer than the edelbrocks so I may go with them. BBC Heads; Ford Heads; Hardware; SBC Heads; Aluminum Pulleys. #1 · Mar 19, 2010. BBC. My dad's set was the D port head with 2. Filters. Most Standard Big-Block Chevy Components! 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. RPM intake will let it breath to the upper 6000 range since its a small BB. World has gone Full Retard. 0L LS, Each Part Number: MLL-PSLS4270CTC 3. ZL1 engines whats the the pros and cons on these heads was there any problems with the casting was thinking of picking up a set for my drag motor thanks in advance. PB 5002. In 1958, Chevrolet released the first big block for use in its trucks and heavier passenger cars. 0 out of 5 stars ( 2 ) FLOTEK Jailbird 390cc CNC Big Block Chevy Cylinder Heads 390-5058BB. What is the true cc of the 049 bbc heads? I read every thing from 113cc to 119cc to 122cc. I have a set of 3999241 in stock form. Like alot of heads from this vintage, they have had some repair work done on one of the rocker arm stud bosses on each head. I'm using L2300F - . Casting numbers on aluminum heads are readily apparent. Brand New. 25-inch dyno headers and the Aeromotive fuel system was filled with premium pump gas. Finding Swap Meet Gold. 5 degree intake valve angle. I. May 23, 2004 · Anyway, I just bought a pair of complete set of '69 427 '074' heads for $550 shipped from a ebay seller (haven't received them yet). They feature an oval intake port design that produces excellent low and midrange torque and horsepower, plus Fast As Cast® runners for near-CNC-ported performance for about the same money Feb 19, 2004 · This head offers the highest average intake port flow and the highest peak flow numbers. Free shipping. I I just got lucky I found a block with matching heads and crank. The aluminum-headed 427, while very conservatively rated at Nov 1, 2007 · It's really easy: Put the parallel flow gaskets on the block, mark the location and size of the three extra holes. Then they built a 509 BBC with iron block and heads, and aluminum intake which weighed 640 pounds. Head Bolt Kit. They were angle milled to 107 cc. to make 525-550hp isnt going to take much cam and youre not going to have to spin this thing to the moon, especially with cnc heads that can support way more HP. It was called the “W” engine and it came in three engine displacements until 1965: 348 cid, 409 cid and 427 cid. Those heads are not common. Don't settle for a lesser set of cylinder heads, these are the best on the market at this price point! 396 427 454 496 502 BBC 115cc Aluminum Heads oval port chevrolet 540 572 new. 0 out of 5 stars ( 2 ) Aug 25, 2009 · The initial 425hp 427 engines in the Corvette were heavy hitters. 25/1. cam it right for the compression cubes and rpm band. Brodix Big Block Chevy BB-1, BB-2 & BB-2 PLUS Series Aluminum Cylinder Heads. The dates are 8/11/68 and 8/30/68. #1 · Feb 23, 2007. seperformance5 (17,016) 100%. Big Block Chevy Oval Port Aluminum Head. BBC Chevrolet 396 427 454 496 502 540 Aluminum Heads 320cc Rectangle port 2. or do I use the tape? Thanks for any info. TECHNICAL DATA. 625HP Carbureted Retrofit Long Block, Assembled, Internal Balance, Aluminum Heads, Chevy, 7. Estimated Ship Date: Jul 2, 2024 (if ordered today) Summit Racing Equipment SpeedCard. Bronze Valve Guides. The 781 are open chamber head so you naturally would use an open chambered piston with the same bore and stroke because of the 396 crankshaft. These heads feature the highest quality intake and exhaust valves and valve springs. My desire is to end up somewhere close to 10-1 CR. lube such as ARP torque lube. Shim, Valve Spring (0. Published: Sep 1, 2009. Aluminum performance cylinder head. Dec 6, 2023 · The three different engine designs used in first generation Camaros all required different cylinder heads: the in-line six-cylinder (L6), the small block V8 (SBC), and the big block V8 (BBC). 330cc Intake Port * 122cc Chamber * 2. 550 in. Cylinder Head, Jailbird 390cc, Solid Roller, CNC Machined, Aluminum, Bowl Blended, Assembled, 0. 25"/1. SBC BBC V6. In Stock. 2L LT2 engine in the 2023 Stingray, the L88 blows it out of the water in terms of actual horsepower. See All 10 Photos. 4. $1,299. Product Results. Produce up to 734 HP Out Of Box With Advanced Port Design. Brand. This NHRA-legal aluminum cylinder head is a replacement for the L88 Big-Block cylinder heads used on 1968-1971 Corvettes and 1969 Camaros. Jan 9, 2009 · When I was a kid ( way back then) I remember that when I changed from closed to open chambered heads, The engine would rev up a lot higher with the open-- The same cam that went to 6800 with the closed would go right up 7500 with the open- This was in around 1970-1972 era. Ships In a Few Days. If you are looking for a race grade head that is comparable to Edelbrock, Dart, Trick Flow, Pro Comp, or AFR at a fraction of the price look no farther then these. 11/32'' Valve Stem. The other head have 4 heli coil repair (see pictures). 190-inch intake and 1. 315-cc rectangular intake ports. Jan 20, 2021 · Before you is Chevrolet’s Mark IV big block, which was introduced in 1965 with 396 cubic inches. Follow along as we baseline our test engine using our Snap-on Tech Center's Dynojet chassis dyno, swap in our new item 2 GM BBC #3946074 396/427/454 Snowflake Aluminum Open Chamber Head L88 ZL1 LS6 GM BBC #3946074 396/427/454 Snowflake Aluminum Open Chamber Head L88 ZL1 LS6 $2,000. I have considered a vacuum secondary carb, could happen. 125 PISTONS 2PC RMS-350 Sep 28, 2018 · While all components need to blend together for optimum performance, the heads have a lot to say about the engine’s final output and reliability. 110cc Combustion Chamber. do a RPM intake. There was also the lesser-known 366 back in the day, which was a low-revving truck engine designed to make good low-end torque. AFR’s new 457cc 18° Big Block Chevy cylinder heads are our best performing highest-flowing heads in our BB Chevy lineup. In unported form these heads will support 500+ horsepower on pump gas. ProMaxx heads have started a revolution in the performance world. 1:1 The L88 427 was the ultimate expression of Chevy’s production Big-Block power, combining a rigid iron cylinder block with lightweight aluminum cylinder heads. They built an iron 427 SBC with aluminum heads and intake. The sbc is a Dart-IE block with raised runner Brodix 18° heads and aluminum pan. c. Oct 12, 2016 · We take a look at building a 21st century version of the legendary ZL1 big-block using the aluminum block from Chevrolet and aftermarket internals. Regardless of grind, the valvetrain needs to be stable at 7000 rpm. different on aluminum heads as to the stock cast iron heads? I do have new bolts with washers and they came with Teflon tape on the threads, shouldn't I be using some kind of assy. Mar 19, 2010 · 23 posts · Joined 2009. Big Block Chevy Compatible Aluminum Cylinder Heads. Even when compared to the 6. Need the cyl head casting numbers. Exhaust port exits are raised 3/4 inch and feature a distinctive vane, giving rise to the popular nickname of the “W” port head. Apr 27, 2021 · 427ci/435hp (aluminum cylinder heads) While the ’66 Corvette had the 427 Turbo-Jet fender flags, the 1967 Corvette boldly proclaimed what was under the “stinger” engine hood; the message these three numbers sent was that this Corvette was the biggest, baddest kid on the block. 280 bore and 3. 750 rectangular port opening. By Engine Builder. $899. 47 watchers. Grab a 1/2" drill and a drill bit of the correct size, and pop the extra holes in the block. srv601. Records Per Page. They come standard with stainless steel 2. 119cc Chambers. Search Within Results. $399. Jun 12, 2011 · Hello all, I just bought a set of aluminum heads to install on my 406 sbc. 760 stroke. 360cc Intake Runners & 119cc Chambers 2. 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. item 6 Chevy BBC Factory Aluminum Heads 3946074 L88 L89 ZL1 LS6 YENCO 427 454 Snowflake Chevy BBC Factory Aluminum Heads 3946074 L88 L89 ZL1 LS6 YENCO 427 454 Snowflake $1,200. Trending at $68. Sort By. 00 shipping Mar 19, 2010 · 23 posts · Joined 2009. 2. 110cc Exhaust Port. 400 intake valves and 1. I have a TH400 transmission and Dana 60 with 3. Alternatively, you can use Victor Reinz # 4918 (R) & #4923 (L) head gaskets on Mark V blocks with our heads. Find many great new & used options and get the best deals for 3919840 427-435hp BBC Rect Port Closed Chamber Heads at the best online prices at eBay! Free shipping for many products! 396 427 454 496 502 BBC 115cc Aluminum Heads oval port chevrolet 540 572 new. This one (14011077) indicates a 1969–1971 rectangular-port big-valve open-chamber version for L88, L89, LS6, and ZL1 engines. 2%. Pushrod Guide Plates - 555-2020201. These heads have rectangular intake ports, round exhaust ports, and open combustion chambers. 24. 00 shipping. Estimated Ship Date: Monday 6/3/2024. Completely Assembled, Sold Individually. Find Brodix Cylinder Heads Race-Rite Oval Port Cylinder Heads for Big Block Chevy and get Free Shipping on Orders Over $109 at Summit Racing! Brodix Cylinder Heads Race-Rite oval port cylinder heads for big block Chevys bolt on directly in place of your stock heads, so you can reuse your intake manifold and pistons. seperformance5 (16,901) 100%. Filter by Vehicle. Cylinder Heads. I am in the process of building a 427. With a 1969 cast date, they would be made from Unobtanium, end of 69 L-88 or ZL-1 427s. Ships Today. 100 over 427. Find Dart Pro 1 Aluminum Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Inspired by Dart's championship winning Pro Stock designs, Dart Pro 1 aluminum cylinder heads cover a wide range of applications from street cars and trucks to all-out racing. 1 . 880" 11/32" valve stems. Would any one know of some general flow charts for the Chevrolet Aluminum BBC head (casting number 3946074)? Acquaintance fell into a set and is comparing these to a set of $3000 AFR's Jan 4, 2012 · The 3904390 are a 427 ci closed chamber heads, you have to use closed chamber pistons for a 4. deepmo_64 (8,652) 99. A 300-5 rectangle port Holley strip Oct 7, 2012 · As for cams, the cam grind should allow the enigne to make power from 4500-7000. Performer RPM Cylinder Heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. It was mainly to look at $/lb and $/hp. Because the stock exhaust ports are in the stock location, you don't have to Chevrolet 396 427 454 496 502 540 BBC Aluminum Heads 320cc Rectangle port roller. Hooker 1 7/8 Longtubes with 3" Exhaust. This is a pair of original GM 3946074 aluminum cylinder heads for Big Block Chevy engines. This is new PAIRof our newly released Assault Racing rectangle port big block Chevy aluminum cylinder heads. Lift, Chevrolet, Big Block Mark IV, Each. Low tension rings MSD 6 Recurved HEI intal timing 16 DEG. 740 to except the largest roller springs. There is NO modification needed on the head castings. Open vs. Jun 6, 2020 · It is very tempting to build a 454; but I have always wanted an iron headed 427. Exhaust Valve Upgrade. 675 lift solid roller Victor intake Demon 825 carb 781 heads. Feb 20, 2019 · Big-Block Chevy Cylinder Head ID. & 1. Aluminum Cylinder Heads. To install our BBC heads on Mark V blocks, you will need to use our SM5233L and SM5233R Elite Series MLS head gaskets. Dec 3, 2023 · Leave the compression alone and put a solid roller in it and you'll have a good 10 second car. The V-6 heads have a 23º valve angle and standard location intake ports. Opens in a new window or tab. Machined for 2. 850 in. We manufacture and sell more aftermarket aluminum cylinder heads than anyone else in the business. Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. 030 pistons. 00 +$125. The ZZ427/480 engine uses aluminum heads filled with 2. I know this is much cheaper than aluminum heads but I would rather put that money towards alot nicer set of heads. Oct 30, 2022 · Chevrolet Zl-1 427 Engine Parts and Parts Numbers. Search New Vehicle. Forged steel cranks have it right on the side of the number 1 rod throw. The 396 swiftly led to what already existed in terms of displacement—the 427, which led to the 402 and 454 in 1970. 20463/8 in. 457cc BBC 18 Racing Cylinder Head. 320cc Intake Runners. 00 shipping Dec 18, 2011 · 1. 300 dome. Remove the gasket. ) - 746-PCE281. $49. Ford 408/427/434 Assemblies SBC 350 Assemblies SBC 383 Assemblies BBC CHEVY 496-572 AFR ENFORCER 335cc ALUMINUM HEADS ASSEMBLED 272-BBC-ENFORCER. Add to cart. Capable of making up to 1000 horsepower, Pro Action BBC Small Block Ford Cast Aluminum Cylinder Head Kit Kit Includes:Cylinder Heads 62cc / 190cc Assembled (Flat Tappet Max Lift: . Heads designed for street performance and mild bracket racing offer excellent mid-range torque and power, and are Nov 3, 2021 · Find many great new & used options and get the best deals for Chevy 396 427 454 496 502 BBC Pair (2) Bare Aluminum Heads Oval Port 540 572 new at the best online prices at eBay! Free shipping for many products! Dec 4, 2009 · Here is the description: You are bidding on a part of GM Aluminum Heads, part # 3946074. Member. Sep 24, 2018 · When it comes to the availability of aftermarket replacement cylinder heads, the number of selections you can choose from for big-block Chevrolet heads is second only to small-block Chevys. Edelbrock Marine-Duty Performer RPM 454 Cylinder Heads 61555. 290cc Intake Port. Sep 1, 2011 · Retail price for these heads is $924. View Details. Edelbrock Performer RPM Air Gap intake (oval port, but would replace if necessary) Edelbrock 750 CFM Carb. The engine weighed 435 pounds without accessories. AFR'S 335cc BBC Enforcer Cylinder heads feature our Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. Oct 30, 2007 · The heads right now are 3993820 castings and the date on them is 1971. Its all they could afford. The Chevy L88 V8 is, to this day, the most impressive engines ever stuffed under the hood of a Corvette. . 250/1. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. 5L SOHC 11044AA633. derosnopS. The exhaust was very impressive creating an E/I ratio of 72%. Two deviations were made to accommodate modern pump gas: 10. Spring pads are machined to 1. Crankshaft casting/forging numbers. The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend; this torque monster is capable of Dec 4, 2009 · Here is the description: You are bidding on a part of GM Aluminum Heads, part # 3946074. +$175. Chevy 396 427 454 496 502 Bbc Pair 2 Bare Aluminum Heads Oval Port 540 572 New. 88" Exhaust Valves. Oct 30, 2007 · 8 posts · Joined 2006. SBC CHEVY 427 ASSEMBLY SCAT & WISECO +10cc DOME 4. #10 · Oct 30, 2007. May 5, 2008 · I'm confused. 880-inch exhaust valves. After running Mar 5, 2013 · For our oval-port big-block build, we chose a set of AFR 300 Magnum heads. My dad and his friends all ran the GM aluminum heads in the 80's. Typical 2. 0L/427 Chevy big block Mark IV Intake Manifolds, Carbureted Tall deck Engine Block Deck Height and get Free Shipping on Orders Over $109 at Summit Racing! $20 Off $250 / $40 Off $500 / $80 Off $1,000 - Use Promo Code: REWARDS OEM 1999-2011 Subaru Engine Cylinder Head Gasket Impreza 2. Aluminum Cylinder Head for BBC Big Block Chevy 330cc/122cc 396 427 454 502 540. Motor was complete when purchased, appeared to be balanced, previous owner of the motor said it was a 454 . They need springs and a valve job, maybe guides before going on my 454. 250"/1. Jan 28, 2011 · Today's aftermarket stuff will cost a half as much and flat out-perform any worked-over L-88 heads, which BTW, would be worth less on the market once you spent money on porting, etc. Well, here's some info. Additionally, there were many different castings and two casting materials (cast iron and aluminum). Like. 83 posts · Joined 2000. BP PB 5001. These heads deliver great throttle response and power from 1,500 to 6,500 RPM. 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 May 4, 2013 · Engine Weights SBC-vs-BBC-vs-BBC. 6 Ratio 3/8 in. Then there's the AFR square-port offerings,. Feb 28, 2009 · 427, stock merlins , 1050 dominator, 11:1, strip dominator, compcams 288ar 2" headers, approx 430hp @ the wheels in a stick vette. A late JUNE casting date in 1970, all is far from lost. New set of complete Aluminum Big Block Chevy Pro Comp Motorsport Heads. BP PB 5000. 030. There are numerous suppliers who offer quality replacement heads for these engines, whether being used with a stock short-block or with a bigger-displacement engine using an aftermarket block. Bbc Big Block Chevy Aluminum Cylinder Heads Bare Casting 345cc Rectangle Port. Posts: 174. According to Al Colvin's book 232 watchers. Searching for 427 Heads online? Locate 427 Heads on sale below with the biggest option of 427 Heads anywhere online. 454C10. Tryin to save some Mar 12, 2009 · 10849 posts · Joined 2006. However, in the aftermarket production of heads, blocks or complete engines continue till this day. Car Craft did a BBC vs SBC comparison article in their March 2003 issue. Made a lot of compression on a +. I'm more about power than numbers. As indicated by the name, the oval-port offerings from Airflow Research featured 300cc intake ports combined with 123cc Mar 21, 2008 · 1969 427 BBC Heads. CHEVROLET. Forged dome pistons with . The 496 is a production 2-bolt block with 781 ovals and Milodon steel pan, and the 548 is a GM Gen-4 block with Dart-IE heads and Moroso steel pan. The 3946074 heads were used on the following applications: 1969 ZL-1 427/430HP All Aluminum engine, 1969 2nd design L-88 427/430HP engine, and the Nov 14, 2011 · I'll list what he has and perhaps a reccomendation will follow. These BB-Chevy heads come in an As-Cast series or Full CNC-Ported series. 98 (equipped) a piece through Summit Racing. Feb 23, 2007 · L48M20 Discussion starter. 47 @ 127mph 3580lbs if im not mistaken. Here's how the weights compare between the 3 motors I weighed. They have custom designed a head to meet the demands of the Big Block Chevy world, while keeping the quality high and the price reasonable. 173 sold. Horsepower was directly affected by the size of the valves in the cylinder head and the size of the Trick Flow® PowerOval® 280 cylinder heads for big block Chevy are an ideal upgrade from factory cast iron heads for street/strip and marine applications. The heads right now are 3993820 castings and the date on them is 1971. Chevy Top End Kit 396 427 454 496 502 BBC Aluminum Heads oval port 540 572. Dec 3, 2023 · Most recent haul of BBC go fast parts ( Snowflake Aluminum heads too) Like many of you guys, I always keep and eye out for old "go fast" parts for the numerous projects I have in the shop or on the back burner Yesterday I went to pick up some intakes and heads and met great gear heads at the same time. Have Accessory holes to except factory accessories. 54 gears. With big heads, smaller is ok ( 230-235 duration solid), with small heads, bigger is ok (240-245 duration on a solid). 00 +$150. 99. Seat Upgrade. One head have 2 repaired bosses (see pictures) that appears to be done professional. These heads are bare and ready for your valve train setup. 450 x 1. By 1967, the Bow Tie brigade launched the L88 427 with then-unheard-of factory aluminum heads. BRODIX is serious about quality and workmanship at every step of the process. 110-cc exhaust ports. Rocker Arm Studs - 555-205805/16 in. Intake runner volume 310 c. Apr 20, 2020 · The high-horsepower version of the first-year 427 was the L72, featuring a beefy block with four-bolt mains, a forged steel crank and rods, forged aluminum 11:1 pistons, a high-performance solid-lifter cam, and huge rectangular-port iron heads fed by a Holley four-barrel carb mounted on a high-rise aluminum intake manifold. sp pz uc te rt gh xx ky pq ok