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I had a big block ford that wouldn't turn over when it got hot. It spun easily when cold. I replaced the starter and the problem was gone.
Yeah, trying to keep it correct and original.Seems like the place to look first since this is when the problems started (pun intended lol).
Call the rebuilder of the starter and tell them the issue. Could be something internal. I'm guessing you are wanting to keep the car correct with original parts?
Good advice - thanks.You might invest in a VOM (volt/ohm meter). Check voltage at battery during crank, should not drop below 10.4v. If it doesn't drop to 10.8 -11.5, it may suggest a resistance or ground issue. You should see a reasonable drop in voltage during crank. Make sure you have a good engine ground wire/strap. Check voltage at starter during crank attempt. Write all the numbers down. It will help the rebuilder with troubleshooting.
You might think about doing the same checks, cold vs hot, as well. To see what, if anything, changes.
Same exact symptoms for my car. It was the starter as others have said. Two things fixed mine and give me peace of mind. Mini starter from Napa auto (for a dodge Dakota) and upsized my smaller size 24 battery to a big block rated size 27. Even with the mini starter sometimes after heat soak the smaller battery would struggle. After going with the size 27 no more issues.