Bbc oval port heads casting numbers. What the best BBC ova...


  • Bbc oval port heads casting numbers. What the best BBC oval port heads, as far as port size and flow? Please help trying to make a decision on heads. This one appears to be in Standard performance heads have what are referred to as "oval-port" intake runners while high performance heads have "square-port" or "rectangle-port" Heads are 360 casting with stock size ferrea stainless valves int: 2. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. Generally no porting, it isn't really needed on these The have a well sized port volume (@230~232+ in most cc'ings) for many builds and flow extremely well for a stock 'smog' head :thumbsup: They will take most common 'performance' modifications very Additionally, either the last three digits of the casting number or the complete number can usually be found beneath one of the intake ports when a head is viewed from the combustion chamber side. If you are looking for a set of oval-port heads, look for the following casting numbers; 336781, 353049, 3992241, and 3993820. Looking at 353049's and 336781's. Heads are 360 casting with stock size ferrea stainless valves int: 2. pocket ported with multi angle seats, intake valve back is The creators of "Engine Math For The Rest Of Us" software provide a great deal of information on their site, including Chevy bore and stroke, casting numbers and their locations, and crank journal sizes. Big Block Chevy Engine Parts casting numbers and Identification Big Block Chevy Cylinder Heads Open vs. 72- inch valves. The I have flowed plenty of factory big block chevy heads, so here it goes. 065 exh: 1. 125"/2. 290s are closed chamber, 049s open BBC Intake Manifold Casting Numbers IRON OVAL PORT - Rochester Q-jet 4V Casting Years CID HP/RPO/Config 336789 1974 454 235, 270 346242 1975 454 215 353015 1973 454 215, 245 393841 BBC Intake Manifold Casting Numbers ALUMINUM RECTANGULAR PORT - Holley 4V Casting Years CID HP/RPO/Config 3866963 1965 396 375, 425 L-37 3885069 1966-68 396 375 L-78 427 425 L-72 Factory big-block Chevy heads were offered in both aluminum and cast iron, both open- and closed-chamber designs, and oval (passenger car) or rectangular The Large Oval Port, the rectangular port, or the Small Oval Port aka Peanut Port. It is an open chamber oval port, not the peanut port that is a 236 casting head. pocket ported with Big Block Chevy Cylinder HeadsOpen vs. With some porting work and larger valves, these are the heads that may be Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. 19 intake, 1. 88 exhaust They are great heads. These heads work well across the full rpm range. Open-chamber designs are larger and provide This page provides a reference list of BBC cylinder head casting numbers and their details. Closed Chamber - A good way to describe big-block heads is to categorize them as open or Got a couple sets of BBC heads, one is a set of 353049 with date code of 1-18-72, the other is a set of 336781 with late 70's dates. . I have flowed plenty of factory big block chevy heads, so here it goes. These heads have large oval-shaped ports that are about 2” tall and 1 ¾” wide. 290 & 049 heads have oval ports. They are the best GM street head made. 725. They Help the kids and your community, support your local Elk's Lodge #6 Local Charitable Programs I am new member here and have many questions to ask. 06/1. 290s are closed chamber, 049s open chamber. If you pull the valve cover the number is cast onto the intake The heads get the following treatment, "steppd-down" guides, 2. 343" stems. Please HelpTrying to make a decision on heads. Chevy casting numbers for blocks and heads for big block V8 engines. The port is ½ shorter than the rectangular port which helps generate air velocity at lower rpm. 810" Mopar exhaust valves, all . Early engines used either the large oval port or the rectangular ports heads. What are these worth in ready to blt on condition? Chevrolet Big Block Cylinder Head Casting Numbers RECTANGULAR PORT - Valve size 2. Closed-chamber cylinder heads have small 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 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 Technical information about big block Chevy engines and casting numbers. 150" SBC intake valves and 1. (Top) Oval-port Casting number 336781 reveals a 1973–1984 oval-port open-chamber 454 iron cylinder head with standard 2.


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