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600cfm or 650 cfm

1K views 4 replies 3 participants last post by  Slant3 
#1 ·
I have a 400sb 30 over ---stock heads with minor work--515 bump stick--bla bla--just want to know which carb would be better 600 or 650 cfm???cause I was told that bigger isn't allways better...I figure the 600 then always up-jet ..I have both and I dont want to get a 750 since I have 2 carbs allready... Thanks
 
#4 ·
it depends alot on the rpm you plan to run if you plan to rev it to 5000 RPMs the 600 is just a little small so Id go with the 650. If you plan to go to 5500 I think the 650 is a bit on the small side, but a 1" open spacer might help. If you plan to go to 6000 RPMs youll need more.
 
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