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tubman · 01-08-2023, 02:55 PM

I hate to sound like a broken record, but the best carburetion for the engine you have and the way you drive is a small base Rochester 2G from a 265 or 283 SBC on a bored out Mercury 4-bolt manifold. The small base 2G flows about as much as 2 94's or 97's and is a lot easier to tune. You will have to change the distributor to use one though.

Also, I wouldn't put a lot of faith in the CR numbers from the manufacturers charts. There are too many factors affecting the final CR. The heads should also be checked and modified for optimum efficiency (increasing both performance and economy). The camshaft can also effect the dynamic compression ratio; do you know what's in your engine?

01-08-2023, 02:55 PM	#5
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,312	Re: 8ba 275 carb options I hate to sound like a broken record, but the best carburetion for the engine you have and the way you drive is a small base Rochester 2G from a 265 or 283 SBC on a bored out Mercury 4-bolt manifold. The small base 2G flows about as much as 2 94's or 97's and is a lot easier to tune. You will have to change the distributor to use one though. Also, I wouldn't put a lot of faith in the CR numbers from the manufacturers charts. There are too many factors affecting the final CR. The heads should also be checked and modified for optimum efficiency (increasing both performance and economy). The camshaft can also effect the dynamic compression ratio; do you know what's in your engine? Last edited by tubman; 01-08-2023 at 03:02 PM.