[no1udknow]

I'm gonna say +1 on the heat soak. My old man had a 72 and everytime it got hot, started cranked slow like it had a dead battery. Let it cool down for about 20 minutes... fired up just fine. If your running headers its even more likely. The other thing is to make sure you don't have a leaking valve cover on that side (everyone swears their sh!# don't leak when I say that) but oil will soak into the starter and dirty up the carbon brushes. If it becomes an ongoing problem, I suggest the remote firewall mounted solenoid route... pretty simple to set up.