Jeff_383
Well-Known Member
Say I have a bone stock 66 440 (516 heads). One valve is bad on the 516's. Have a set of 906's that are fine shape. Is anything gained or lost by tossing on the 906's? Other than the comp drop, which is how much?
Would that be a gain or a wash then?I was told it is approximately 3/4 of a point. The flow is slightly better since the 906 uses a larger exhaust valve.