[mreid]

Do you have a standard or mini-starter? Heat soak is more of an issue with standard starters. It is also one of the reasons with a mini-starter and a firewall mounted solenoid, the high current positive battery lead is not switched, the start signal is. This then points to proper grounding of the starter/engine. What kind of ground are you using? Did you run the negative battery post directly to the engine and then a ground strap to the chassis or the other way around?