Hot Start Problems

check your grounds
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Yes, usuaaly it will crank but very slowly as though the battery were low.

Does it like try to crank but very slow?

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Yes it will usually crank but very slowly as though the battery were weak.

If the spark is set too far advanced it will start hard,especially when hot. Try retarding the distributor. You may also have stuck fly weights in the distributor, creating too much advance.

First thing to do is check the timing. Too far advanced will make a hot
engine not start. Check the initial, running & if all else fails the cam
(ie make sure your timing marks on cam and crank line up with not chain
slop).
Charles

Thanks for the timing suggestion. It appears to have worked.

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Ignition timing has nothing to do with how fast or slow a starter cranks
when the engine is hot or cold. Your problem is likely caused by bad
battery cables/connections, especially the main ground. Check all cables
for corrosion and clean all contact points.

As temp increases so does resistance, so what's happening is your marginal
connections are fine when cold, but don't flow enough juice when hot and the
resistance is higher.

Doc

I just wanted you to know I had a 72 nova that i put headers on and it
cranked slow i thought the starter was over heating,reset the timing and
it started fine.
Bobby

Retarding timing for easier HOT starts is a OLD Demolition Derby trick.
Basically when a Engine is past XXX degrees it spins over slower then it
does at ambient.

A heat soaked, weak, or dying starter compounds this problem.
As does a weak battery.

Now when it comes to Old SBC's over the years timing chains can
streach, heads can crack, starters lose there "ass"( or some jason puts
a low torque in place of a high torque). If the timing is advanced for
say 92 or 93 Octane, and the truck is running on 87 Octane, with worn
parts, Retarding the timing some will help it start better.

Charles