Thanks for the responses, I had no idea that a tire pressure question would evoke such emotion. I agree that tire pressure is important. I am sure that one would never find tires of the vehicles that I am associated to 'under inflated'.
My question is driven by the fact that this car with these tires will be driven hard in performance venues like drag races and autocross events. The car is far from stock. That is why I found the thought that I should be referencing the 1968 OE stock sized tires and 1968 OE load capacity amusing.
I feel much the same way concerning using the calculations mentioned in the above post, as mentioned due to the vehicle weight vs tire capacity with modern OS tires. To me it is obvious that to just carry they 'load' not much air pressure will be needed. And that would not be a good situation for handling.
I am wanting the air pressure required to flatten the tire tread to the road surface and to properly stiffen the side wall to minimize heat build up and minimize side wall tire flex in sharp turns. Doing the chalk test as described in post #2 to me is a direct route to the flatten the tire tread to the road surface half of the question.
I can get the other half answered with some track time.
thanks
