Originally posted by lt1s10
southerner, every thing you have explained in your last post is still a way to get max. out of a motor, not a way so you can put that carb. on a lot of dif. motors. if you have a motor that needs 850 cfm to make it perform its max. then you can't put a 600 cfm carb. on it and expect it to perform to its max. the Ventura is not gonna change. you could put it on a motor that called for a 500 cfm carb and make it work about 1/2 way, but that's all it will do. i dont know where you and dr_bowtie have come up with the idea that a holly carb. is a 1 fit all. im not talking about 68Gem, he needs a 600 or less, but im talking about some statements that has been made about carb. as a whole. there is a certain cfm needed for every dif. motor and you take the closet thing holly makes and bolt it on and re jet it to fine tune it. the venturi size is for WOT and you fine turn it below WOT with jets, power valves,and vac. secondarys to perform at lower speeds. the Q-JET gives you a little more room to play with, because it has an adjustabul secondery venturi with a lot more choices of jets and metering rods. you can fine tune a Q-JET a lot more than a holly.
True . I can recall a company by the name of Ford ( think) put some holleys on it's smaller engines and they were rated at 585 CFM's