Quote:

Have w8 with vac pump when at a idle it has 68 psi but at 7000 it drop to 30 psi this is at 13 inch of vac this motor has a belt drive oil pump if I unhook vac pump it hold 68 psi anyone ever have this problem or is this the norm with this set up THANKS

Ae you talking about crankcase pressure loss or oil pressure loss

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