Bbc Peanut Port Heads Casting Numbers

Rectangular port valve size 2 19 intake 1 88 exhaust.

Bbc peanut port heads casting numbers.

1973 bone stock bbc 049 casting number heads w slighly better springs stock retainers and locks nylon seals. Used on 396ci truck engines. Lots of people run em including me on my 496. 68 and 69 oval port closed chamber 2 06 and 1 72 inch valves.

Bowtie aluminum mkiv raised runners 1st design. Aluminum fits mkiv c port also sold as a solid head. To equal those numbers a small block. When chevy introduced the gen vi iteration they replaced the small oval port heads with conventional sized oval ported that flowed considerably better than their smaller brethren.

The 781 s and the 049 casting numbers last 3 digits are the best oval port heads that gm made for performance. I put some work into them like opened up the intake port vol. With the casting number 3904392 this aluminum head was used on 1967 l88 and l89 engines. Bowtie aluminum signature series fits mkiv gen v gen vi raised runners 2nd design.

Bowtie aluminum mkiv raw casting of 861 mkiv 1st design. For example a stock production 049 oval port big block iron head with stock valves starts life with a 253cc intake port and flows 232 cfm at 0 400 inch and 250 cfm at 0 500 inch valve lifts. Nothing wrong with them at all up to around 550 600hp with the larger 2 19 1 88 valves installed and a lil bowl hoggin and gakset matching. To 244cc and the exh.

I actually have the peanut port heads on my engine my casting s are 346236 from 1976. For the uninitiated peanut port refers to the small oval port heads used on the gen v 454 truck motors run prior to the introduction of the gen vi in 1996. In my opinion all the bbc heads have potential but there are some that have a whole lot more.