[Pat68HO]

Originally Posted by johnta1

Can't answer all the questions, but I think the gear ratio or something isn't right on your RPM at 70?
(unless you are using a real small diameter tire)

Try this calculator:

Calc RPM, Gear, MPH, Tire Diameter

On question #2, If it's like POCI, I would think as long as it was available in that year, it would be good to go.
(don't think they check cowl tag to actual paint?)

Thank you for the calculator- definitely going on my favorites tab!

You're right, John... something just doesn't add up. I have 235/60-15 tires (26.1" diameter) and 3.55 gears ("WH" stamped on the rear axle). According to the calculator, I should be turning 3200 rpm at 70 mph. I think the speedometer is close enough because when I keep pace with the traffic on the interstate, it is showing 70 mph give or take a couple of mph. I have hood tach which I don't think is the original... has there been any problems with the accuracy of the reproduction units?

I think I will take it out on I-81 this weekend and double check my readings.

On question #2, it is painted starlite black which was available in 68. Now, I do have 15" Rally II's (which I guess weren't available till 1970?) with radials and a Judge T-handle shifter. I just don't know if these changes kick me out of stock class and put me in modified class (or whatever they call it).