Diagnosis needed.

[nvr2late]

When cold car fires up effortlessly. When hot, will not start and battery runs down rather quickly.
I appreciate your thoughts. Thanks.

 

[pacecarta]

no start (crank) hot can be cause by heat soak solenoid or the starter , poor connections and heat soaked battery cables can also affect cranking , may be time for a new starter and possibly some heat shielding , factory had a metal solenoid shield attached to the block
certain headers (like atr style) make heat issues on starter and cables worse than the factory setup

as for battery running down quickly , could just be the starter load is higher due to age or contamination or the battery could just be weak old and time for a replacement , have it load tested or just replace it with something with a higher cca and reserve rating

 

[SHADOWII]

If you have a hand held laser/temperature gun, you can check the temps of the cables, etc. That would help reduce your troubleshooting time. Corroded ends on the positive cable can turn the cable into a resister when heated.

 

[nvr2late]

Thanks for your help everyone.