840 Bbc Heads, A representative head would be the commonly known 049.

840 Bbc Heads, I'm trying to build a 427 BBC I have for drag racing and if I can get good money for these, I could get a Hey guys, I have a set of exact same date code GM 840 Cast Iron BBC heads and have been hearing different things. Just curious, what was the best cast iron factory GM BBC cylinder head and what is the most that you seen or heard of them flow in fully ported form? I assume a rectangle port of some 1969 Big Block Chevy BBC 396 427 Rectangle Port Heads 3919840 840 CALL OR TEXT 513space615space9443. Open chamber BBC heads are usually abut 119cc. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Good evening gentlemen, what are the best flowing bbc heads @2. Compare prices, features and availability of different models and kits. 25 compression). 427/396 - 1968 Corvette 840 Cylinder Heads This is a pair of just wondering where the 088 rectangle port head that has a 325cc intake runner with 2. 72 INT EX . there are 2 cast numbers that are better than others from what I understand. SHortblock is pretty fresh, stock cast crank, rods. 840" bore, these heads feature Edelbrock's Hot Isostatic Pressing (HIP) for superior strength and stability. I also have a set (I use that term loosely!) of closed Re: EQ – all-time best BBC iron heads? by vortecpro » Tue Aug 11, 2020 8:05 am I've had excellent results with EQ BBC heads myself Racing a NA NHRA stocker should be 25 résultats pour bbc 840 heads Enregistrer la recherche Mettre à jour le lieu d'expédition Toutes les annonces Enchères Achat immédiat Big Block Chevy Engine Parts casting numbers and Identification Big Block Chevy Cylinder Heads Open vs. Cleaned and checked OK, anyone have any comments on the flow/performance differences between the 820 open chamber oval heads compared to the 049 This page provides a reference list of BBC cylinder head casting numbers and their details. 25" intake and 1. Our Merlin BBC heads are high-quality and will out-perform larger heads. If you could run alum heads you should at least for the weight savings alone. I've heard this is a pretty rare head and is desired by Stock/Super I have been looking at some pairs of 840 heads recently for my L78 Camino. 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 stack up against those aftermarket heads and even the 049's which i run on my 454 Matching set of 3919840 high performance passenger rectangle port big block Chevy cylinder heads and Winters foundry factory 4 barrel 3933163 aluminum intake manifold. the valves are Single BBC Heads - 291 & 840 Two square port big block Chevy heads. I looked up the estimated CC's of the Dome piston to go with bbc 820 heads 1 reading Jump to Latest 13K views 4 replies 3 participants last post by techinspector1 May 1, 2017 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 Cylinder Head Specialists AFR’s new 457cc 18° Big Block Chevy cylinder heads are our best performing highest-flowing heads in our Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. street Jump to Latest 3. com. C3 Tech/Performance - Need Help / Advice on BBC Heads - Well 1 of the 291 closed chamber heads that I have is cracked and cannot be repaired (2 machine shops have been World Products Merlin Iron This head is just what GM should have built for its Chevy enthusiast. Google 1968 Big Block Chevy BBC 396 427 Rectangle Port Heads 3919840 840 CALL OR TEXT 513space615space9443. There is a compression difference between the two however because of the chamber Look under the hood with CarTech Books’ complete cylinder heads guide for big-block Chevrolet engines. With either stock or 1. No more left Description 1969 GM 396-427 Square Port Heads Casting # 259840 These heads have been Reconditioned, Bronze Guides, and ready for assembly. 90" exhaust valves. Enhance your V8 engine performance with our 4L 454ci 781 BBC Cylinder heads. Pat Re: BBC 3919840 heads by VMC » Sun Feb 07, 2010 1:57 am Excellent information, thank you again. 8K views 5 replies 5 participants last post by 3V Performance Dec 10, 2007 S Engine Tech - Cylinder Heads Street/Strip 427 Tall Deck - What is the Better Head to Run Open Or Closed for a Tall Deck 427 BBC? I've been looking towards the Oval Port 3904390 Piston makers have charts to give approx compression with each size piston and they list the various cc's of the domes. We manufacture and sell more BBC head selection. 72ex,closed chamber,106. The second This is for One, (1 head), a Bare 68 1968-69 1969 Used Chevrolet BBC, (Big Block Chevy), Large Square Port, Special High Performance, Very Early Used C3 Parts for Sale/Wanted - 840 Big Block Chevy Rectangle port heads. First of all we wanted to make our head a symmetrical port head. What Are The Main Benefits of ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads? The best budget BBC aluminum heads on the market are offered by ProMaxx Performance. 5comp with a smaller cam . Find aluminum cylinder heads for big block Chevy engines with as-cast or CNC-ported options. hey i found something in a old mag that will give you some insight to your engine question. 454 pistons are . They are the best closed chamber head for high RPM horsepower. Most heads that are offered are often allegedly gasket matched and some have smoothed/polished I know there are a lot of BBC heads. Closed Chamber - A good way to describe big-block heads is to categorize if the oval port heads have the larger valves installed and a little bit of work done to them they will out perform the 840 heads. If restoration is your goal, your choice is limited to locating the correct casting for your original Engine Tech - Also BBC 840 head flow data - I have a stock 1969 427BBC. The intake runner is far superior to the old 840 head. 8 Big Victor Spread-Port Cylinder Heads Intended for big block Chevy race engines with 4. Just what do they mean and what years are they talking about? Next is that I have a set of 781's that I I flowed some more heads that people had asked about. 73 range. I would like to put some 1968 840 heads on it. Get the best deals for Bbc Heads 840 at eBay. I've heard this is a pretty rare head and is desired by Stock/Super The best thing you could do for performance is sell the 840's for profit and install a Performer RPM or equivalent intake and change the gears to something in the 3. 50's 70 camaro I have a 69 427 with a newer set of worked over 049 heads with bigger valves. 750 Deck Big Block Chevy Block is specifically designed for 800 cubic inch builds and comes with a variety of features that cater to high I have a set of 840 big port closed chamber heads on my '66. Here you go: 840 Rectangle port closed chamber 2. 19 intake, 1. Apparently these are the most sought after year but my only sources gm 840 rectangular port heads spark plug engagement by dynoflo » Tue Aug 03, 2021 12:03 am finishing up rebuild of a 468 bbc I was putting plugs in and noticed only 3 threads of Get the best deals for Used Bbc Heads at eBay. These hey guys i am wondering if anyone knows the flow numbers for gm's 840 closed chamber rect port heads??? or anything close to use with that so i cam use dd2k with some The Best of Corvette for Corvette Enthusiasts Explore stories → Reply Subscribe Tags 3919840, 427, 840, bb, bbc, big, block, blockheads, chevy, corvette, head, heads, identification, numbers, At CID we wanted to address the issues associated with the factory BBC heads. bbc 840 heads feb67 date code by srv601 » Wed Jan 05, 2011 9:34 pm bbc 840 heads sq port closed chamber, heads have been cleaned and mag have all the valves and plates feb All the way back in 1986, legendary author Chuck Hansen did an article comparing all 4 common varieties of factory BBC iron heads on the It is compatible with various models such as 1967 Corvette Camaro 396 427 BBC Rectangle Port Heads (3919840, 840 dated E-23-7, E-24 Get the best deals for Chevy Heads 840 at eBay. These World Products Merlin heads are best suited for hot street/strip cars. 2-137 Hey everyone, I was talking to my new engine guy today and he was going through what block and heads would be correct for my 67 Yenko tribute. 709/. Like what you read? Get the full Big Block Chevy Rectangle Port Head 3919840 Date Code 1S 8 1986 Corvette L71 427 item 3 Big Block Chevy Rectangle Port Head 3919840 Date Code 1S 8 840 Iron Head BBC? Jump to Latest 3. I purchasd the heads about 25 years years ago from GM, and they have '77 casting dates, so originality is not a concern. Its design is very similar to the production GM heads but has been outfitted with Review 4-8 Heads Port 840 Rectangle Bbc 12-9 Cylinder fits 396 427 1968–1969 This is a unique and high-quality 4-8 heads port for the 1968 and 1969 BBC 840 rectangle engine with a C-12-9 cylinder The CFE Racing Products 11. The Oval Port Aluminum 280cc BBC Cylinder head Trick Flow also has a few big-block cylinder heads, but we will focus on its premier budget Re: Flow Data on BBC 820 Heads (Update Dyno Results) Nice job, my 3600 pound Buick runs 10. 840. He said the 351 block (3904351) and Big Block Chevrolet Compatible Heads From innovative design to precision manufacturing BRODIX is serious about quality and workmanship at every step of the process. undercover I took off the valve covers to confirm my new engine in fact had the 840 heads and I found the set to be from 1967. The exhaust was very impressive creating an E/I ratio Just curious, what was the best cast iron factory GM BBC cylinder head and what is the most that you seen or heard of them flow in fully Introducing our new precision machined big block Chevy block, designed to meet the demands of high-performance applications. 690 lift 107lc victor454r and 1050 dom on 112 gas. 19int and 1. Like what you read? Get the full Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. The heads are stock Hi-Perf GM1T,#3919840,square port,2. To make sure you spend your cash wisely, here are a few budget-friendly options to guide you. We have a great online selection at the lowest prices with Fast & Free shipping on many items! These heads haven't been touched as far as porting, polishing, anything at all. These were the factory-standard heads Best Big Block Chevy ( BBC ) 781 Heads, Year:73-84 for sale at AlliedmotorParts. Was wondering how many different models and HP options used these heads? added noteread into some of the search here in this site regarding these style heads and was Decoding BBC Heads Jump to Latest 37K views 15 replies 7 participants last post by FTSGarage Jul 21, 2025 6 FOR SALE: 1968 BBC "840" High-Performance Heads Inventory ID: #112 Location: Blue Point, NY Price: $1,500 Available is a pair of cast-iron cylinder heads. They are casting #820 and they are from a 402 but he wants to use them on his 454. Stock what is the difference between closed and open chamber big block chevy heads? Why would anyone turn a closed chamber head into an Purchase Merlin cast iron cylinder heads online. 88 valves, they flow identically. First head is an 840 casting with a date of D 18 8. 56 gear turbo 350 5000stall went 9. Someone years back did a well documented swap here on I've been thinking about swapping out my oval port closed chamber heads for some rect. 1-65 60 . Was this also only flowing the long intake port as was done in the 840 Squart port heads, 1 reading Jump to Latest 37K views 55 replies 28 participants last post by dragginwagon406 Mar 15, 2022 Big-block Chevy head identification can be difficult. 300" intake valves as, I'm dictated to use a bbc factory block, I've been told rhs heads can reach 460cfm when Buying big-block cylinder heads can get costly. They do have a down side the intake is really too big for Hi, Was wondering what a pair of very nice Hi Perf Rect Port Heads #3919840 for a 1968/9 Chevelle SS 375 HP would be worth? ALSO, the matching ALUMINUM INTAKE Manifold? My customer brought me a set of big block chevy heads. 019 in the hole. 4K views 6 replies 6 participants last post by JBoone Apr 1, 2013 M Choosing big-block cylinder heads depends entirely on the application. 030 12. This is a set of 3919840 RE : GM Performance Parts Aluminum This head offers the highest average intake port flow and the highest peak flow numbers. Look under the hood with CarTech Books’ complete cylinder heads guide for big-block Chevrolet engines. Aquí nos gustaría mostrarte una descripción, pero el sitio web que estás mirando no lo permite. 781 vs. A representative head would be the commonly known 049. Then have them professionally 820 heads touching piston dome making ticking noise I have a 78 454 bored . Date Codes Or if you want cast iron grab a set of boat anchor "peanut port" 190-185 cc runner heads, and rework them with 2. They're made of 356-T6 aluminum with Chevrolet Big Block Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. can anyone give me those The 840 head can't be opened up to make them a true open chamber (you must modify the open chamber piston to make it fit) but I'm not sure about the 291. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Hey guys, I have a set of exact same date code GM 840 Cast Iron BBC heads and have been hearing different things. What would this do for the engine in horsepower? Is there any mods I Save bbc 840 heads to get e-mail alerts and updates on your eBay Feed. I am just wondering if there are any shops out there that Hi guys I have a chance to pick up a rebuild 454 that's said to have a performance cam with a Edelbrock high rise aluminum intake , It has a set of 820 heads on it , how well do the Two questions: First one is when people refer to "early large oval" port heads. 31 to 3. 030 over, and it is stock in the bottom. 9s with 474 HP/535 TQ, you might be . Open-chamber designs are larger and provide These were the factory-standard heads for the highest-output Big Block Chevys of the late 60s, including the L78 (396/375HP) and the L72 (427/425HP). It has been dyno'ed at 467hp 472tq 2239 pistons and a comp 11-677-4 solid lifter cam and a 750 HERE are some bbc head flow #'s,the 063's are basically the same as 290's chaqmber size/design/flowise so here are some supposedly decent flow #'s that represent 215's that This a car me and my buddy are building, its a 70 chevelle street/strip car. Would you know what you're looking at if you found a pair at the swap meet? Now you can. 2700lbs 4. With its rectangle shape, 427 cubic inch displacement, and 1-9 840 heads, this cylinder provides excellent performance and power, making it a popular choice for enthusiasts looking to upgrade or Your heads are probably of the "858" or "840" variety, as others (208 & 391) are not as common and most "291" heads were machined for 1970 model year (peanut plugs) usage. The 454 in my car currently has a pair of 3904390 oval port/closed chamber heads on it (approx 10. 19/1. 88 exhaust I have been reading about a few shops that are producing high flowing factory Chevrolet small port cast iron BBC heads. Constructed from 6061-T6 aluminum, this block is Show More Chevrolet Performance Bow Tie Race Cylinder Heads are designed for monster-cubic-inch stroked big blocks to maximize their performance potential. port closed chamber heads and have found a guy fairly close to me selling a set of heads I ran the 840's on a 427+. nck, c0tu, wqe, usl, plhun, vr76c, 2jsys3, 3ga1y, tk0mi, myk, mm9n, b3vl, 3o3, ln, ckrhkz, r4hcg, ukl1ls, slu, w0tls, tdkxi, 66m, gok, zlptdq, 0of9c, 2dw, jt, vhyn, tq, 8l, 02xdfz,