Low vacuum question

For 72* of overlap that vacuum is very close to what it should be for the centerline of that cam, and you said that it was 1* advanced so this makes it worse. If you cut 10-12* of overlap out which will make the cam be ground on a 112 centerline then the vacum will come back. With that cam and the valve size the bottom end power and torque will suffer some and the vacuum shows it.



BJR Racing