Robert, Thanks. If the calipers are bad, I will most likely go with the 69 calipers. I can't event find the 4 piston calipers anymore, where as the 69s are readily available and only cost $26 in the NPD catalog.

Question. I see there is a different part number for a 4 piston rotor (which I have on the car now) then for the 69 single piston rotor. If I switch to the 69 caliper, will it just bolt on and work with the 4 piston rotor? Or will I have to change my rotors too?

Catalina, you bring a good point. No I haven't taken a drive to see the affects of the new equipment. The reason I haven't is because by isolating the issue to the caliper level (no fluid in the caliper and the issue remained), it would seem that any equipment previous to the caliper wouldn’t affect the outcome.

I'll check for piston rock and then go for a ride to see where we're at. I have to run the engine anyway to continue to troubleshoot the apparent overheating issue I have.