i dont know the answer to ur ???, but, i do know that people have taken the 660's & put the 850 base plate on them & made them work fine...depending on ur application (motor, usage, etc), i would either upgrade the 650, especially if its a DP mech sec or shop for a 700DP or 750DP mech sec...both work fine on stock to mild motors...i have a 650DP mech sec modified by myself on a Edel air gap manif on a mild BBC 427 that works pretty damn good for my purpose...just my .02 centscan anybody explain how you can take a 650 holley, buy an 850 proform body, and it becomes an 850???????????
these kits dont come with bigger butterflies....(or do they)???
as far as i can see------bigger venturies, same throttle plate?????? = bigger carb?????
trying to make up my mind on what and which carb to buy, or upgrade mine??
thanx for any and all help!