[Joe Wicked]

I posted the solution I did in your other thread, I had a 460 in a 79 F150 and had the exact problems you are describing. It wasn't the prettiest fix, but I made a dual heat shield that the 2 plates did not touch each other at all. They even mounted at different points. I also had a fan blowing air across them to help cool. The fan was a small 12V fan and it ran for 5 minutes after the truck was shut off. This helped to keep the starter cooler, and cool it down when shut off.

The battery cable size could also affect it as described though, especially with a trunk mounted battery. That is a long cable.