Quote:
Originally Posted by AZ59apacheguy
Hi. I found the numbers on the face and it is a 6.5 power valve. According to the one video I saw, you take your manifold vacuum and devide by two, since mine is a stock engine and manifold and it normally runs around 19inches, does that mean I need the 7.5? Or is the 6.5 good enough?
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That’s the normal way to figure it but Holley specs that carbwith a 2.5 for some reason. Maybe it has to do with the low cfm. A higher rated valve around 6.5 might have it way over fueling.
I’d set it up too factory spec and go from there.
I see the 670 gets a 6.5. Maybe the cfm dictates the valve size.