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Showing 10-10.5 on vaccum gauge.Six pack has a 6.5 valve in it should i change it?If so do i do a number 5 valve.

What does the vacume gauge show with the car idling in gear, if it is a automatic trans? If above 8.0 inches leave the 6.5 in it Holley power valves come in half inch increments from 2.5 with one inch increases to 10.5 inches, not even inches like 4.0, 5.0 and so on IHTHs BTW, six paks rule

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)