hey guys my motor is a carbed 350
when the car is cool or cold and i turn the key, the motor turns perfect, the starter cranks away..
BUT lets say i drive around for a while and get the motor fully warmed up and i turn the car off... if i try to start it back up the motor barely turns.. you can hear the starter "wah.... wah... wah.." sounding like a very weak battery.. but when i let the motor cool off, the starter turns it over perfect again..

anyone know why this is? again it is only when the motor is HOT right after i turn the car off and try to start it soon after when i have this problem..

when started the motor runs fine, no stalling or anything

 

Starter is getting to hot it needs a heat sheild

 

Could be the starter is getting too hot, could also be that the timing is too far advanced. I assume it doesnt have some sort of crazy compression ratio does it?

 

Althou a starter heat shield is a good idea, it won't likely cure your problem.
First thing to do is to check and clean all the starter/ battery/ engine ground connections. Measure both the + and - battery cables electrical resistance with a Ohm meter. measure the voltage drop read off the starter solenoid to starter.
(read accross the solenoid during cranking. )

You can relieve the strain on the starter motor during a hot start by employing a ignition timing crank retard ( MSD Starter saver). this device backs off the spark timing during cranking automaticaly and restores the timing once the motor fires.

A cheaper yet effective solution is to simply wire in a dash mounted cut out switch on the B+ power wire of your HEI distributor or B+ switching wire of your MSD6A. Disable the spark during hot cranking with the switch off (it will crank easily), then throw the switch and it will fire right up. Doubles as a stealthy anti theft ignition disabler.

 

My first response would be you've got your ignition timing set to high. Drop it down 2 degrees at a time and see what happens.

Second response would be the starter is failing.

 

Running a dual switch (ignition / starter) like F-Bird said works really well. That's how I run mine, never had an issue with it. Although, getting rid of the factory direct drive junk and replacing it with a good gear reduction starter helped tremendously.