mike623

Thanks, Mike

joe_padavano

The stock Qjet was rated at 750 cfm, but that's not a fair comparison because the air valve on the Qjet is adjusted to limit airflow to what the engine needs.

The theoretical airflow of a 350 cu in motor at 5,000 RPM is just over 500 CFM. At 6,000 RPM, the theoretical airflow is just over 600 CFM. The "best" carb for the appliation will ultimately depend on the details of the engine and how it's used. Usually, a carb somewhat larger than the theoretical value provides a little better HP, but a carb closer to the theoretical limit will probably provide better fuel economy and crisper performance on the street. Your call.

Olds64

Mike, you should be fine with the carb you have now. If you aren't happy with the performance then perhaps you should adjust the jets or metering rods before spending big bucks on a new carb. Holleys are good carburetors.

jag1886

I agree that you have a good carb that is sized correctly now, if your performance is not that good and you are using the stock manifold it could be from some of those awful adapter plates on the market. A manifold change may be a better solution. I just replaced the stock 4GC and cast iron manifold on my 65 with an Edelbrock and a 600 Holley and it was well worth the investment.