How tall are your rear tires and how high do you want to spin that 390? There are many online calculators for rpms. I have a formula to do the math the old fashioned way, but it's out in the garage.

Devin


If you can't hose it out it ain't a truck

55 3100
63 Corvair Monza
64 El Camino
72 240Z
01 Suburban