Thread: BBC head question...Pat or Erik?

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What size of combustion chamber should I be looking for and also what runner size too? The hyd roller cam is 231/239 @ .050 with 626 lift across the board. The transmission is a built turbo 400 with a 2600 - 2800 stall. No serious drag racing at tracks...just power & torque with tire spin...Hossier Pro Street radials.

Originally Posted by stylingZ

What size of combustion chamber should I be looking for and also what runner size too? The hyd roller cam is 231/239 @ .050 with 626 lift across the board. The transmission is a built turbo 400 with a 2600 - 2800 stall. No serious drag racing at tracks...just power & torque with tire spin...Hossier Pro Street radials.

big O ports or small rect ports

Originally Posted by stylingZ

What size of combustion chamber should I be looking for and also what runner size too? The hyd roller cam is 231/239 @ .050 with 626 lift across the board. The transmission is a built turbo 400 with a 2600 - 2800 stall. No serious drag racing at tracks...just power & torque with tire spin...Hossier Pro Street radials.

With that size cam I would guess the engine would be done making power by 6,200 rpm's.
If you wanted to get by on the cheap and had a set of the 781's you could do some bowl work, gasket match and install 2.19/1.88 valves and call it good.
My first choice would be the Brodix 270 cc oval's or a set of the Edelbrock's 290 cc oval ports.
The Edelbrock heads also have a 110 cc combustion chamber size which might raise your comp. ratio to much.