RE: Holley 4160 ?'s
the top one is used for vacuum to the dist. if you have a vacumm advance thier so no vacuum there until you open the throttle..like roundy said if you don't need it plug it off......the one at the base most people use for a pcv valve...the other one can be blocked off....I can't beieve it even runs..you'll have some tuning to do..that's a fairly old 600
|