67mustang302

Larger carbs CAN work, but itrequires a good carb with boosters that are extremely sensitive to metering signal. Newer modern carbs with recent booster designs are capable of pulling and effectively atomising fuel at less than 0.5" of vacuum. But, it requires you to a) know what the hell you're doing, b) have a good carb that's capable of working in that application and c) still have an appropriate cfmsize for the carb and engine you have. That being said, if you don't wanna spend that kinda money on a carb and get it tuned right, then 650 will be plenty. I'm only running 570 on my 302 and it's putting out 370+hp at the flywheel. A GOOD carburetor will always be better than a medicore one that's larger. Ultimately the key is to provide the proper AFR and have good atomization.

tinman

You guy's know that by 'jetting' you are only changing the amount of gas into the engine, it has NO effect on how much air enters..........