[bignate]

Putting together a budget build roach of a ‘66 GTO to drive while I finish my Judge and dually. I have a .060” over 455 with 4 valve relief cast flat tops. Using 1970 #64 heads, 2802 cam, and ‘66 Tripower. I feel this combo should make decent low end torque. The car has its original M20 trans and I’ll be running 235/60r14 tires on 14x7 Ralley IIs.

If I did my calculations correctly, running a 2.73 rear gear with these tires (25” diameter) should have basically the same effective gear ratio as a 1970 GTO 455 4 speed close ratio with 3.36 gears and G78-14 (26.7”) tires, which I believe was factory; would have.

Car is being put together to cruise, I’d like to drive it long distances much of which will be freeway. It definitely is not going to be raced. Am I asking for trouble with in town driving? Is this going to be a clutch destroyer?

I’ve done every gear ratio mph calculation I can, and it all seems to work out theoretically; but I know calculations and real world results sometimes don’t always agree.

Thanks, Nate