Teddaniel

1970. 383 cuda starts right up and drives fine. When I go to start it after driving say a 1/2 hour or so it won’t turn over. It has a new battery. When they jump it it takes a while for the jumping charge to take effect to even turn the engine over. If it cools down for 2 hours it starts right up. Any thought on what might be wrong?

Archer

Ted -

The engine (starter) won't spin or the engine won't ignite?
Heat expansion resulting in a ground short?
Bad electronic control box? (Been there, done that.)

Archer

Iowan

Does it have headers on it because it sounds like you need a starter or a heat shield for the starter...

Teddaniel

Is there a test I can do to prove this out

Iowan

I would first verify the connection of the battery cables (both of them) are good and that the cables are in good condition. I suppose the starter solenoid could be giving up also. To check out the starter you need to pull it and have someone run a load test, ORille’s, western auto, Advance Auto etc.can do it. The soleniod can be replaced cheap enough same with the cables.

Iowan

It’s possible that your new battery is junk also, I had that with a tractor once.