[Paul Workman]

Originally Posted by Corvette95

Heat soak on the starter. (drive the car about 20-30 minutes and get it hot, turn it off, let it sit 5 minutes and try to start it...likely will not start, but will start cold.)
If you haven't done the relay upgrade yet, I would do it because it will need it, if not now,...later, but sounds like it's time for a starter rebuild and valley cleanout.

I've had that (heat soak) issue with a Delco Remy (GM starter) - once on my wife's '69 C3 in fact and once on a 427 El Camiino I had for a while. But, never heard of it with a Denso (ZR-1) starter. Clutch safety switch, yeah. And, the internal solenoid contacts ( a common Denso issue in fact), but no "heat soaked" Densos. Anybody else??