starting problem

[LMREESE]

My 67 short fleet has a starting problem that has been plaguing me for years. First thing in the morning it will roll over like a champ but after the motor warms up, if you shut it off it is sluggish to start. Instead of a fast spin you get ka-runk ka-runk ka-runk like an almost dead battery. It usually starts back on the third or fourth ka-runk. If you let it set for awhile it will roll over and start fine. The engine is a 350 bored 30 over with double hump heads. I dont remember the compression ratio. I put new battery cables on with no better results. I put in a new starter a couple years ago but no help there either. Today it didn't start back till I let it set and cool down. I went and bought a new battery with 1000 cranking amps and that helped a lot but it still wont roll over as good as when the engine is completely cool. Any ideas
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[Mr Chevorlet]

Need to get a heat shield to protect your starter from heat from the exhaust

[geezer#99]

Heat shield might help for your heat soak problem but heres the ultimate cure.
http://67-72chevytrucks.com/vboard/s...d.php?t=475748

[LMREESE]

Thanks for the link. So the solenoid on my starter is the problem?
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[geezer#99]

Solenoid and starter get heat soaked. Heat causes electrical resistance.

[Steeveedee]

If you crank under these conditions (my truck used to do the same thing; that 400 BBC with AC in sunny California gets really hot on long trips). The extra load is going to take your battery down fast. Unlike us pumping iron, the battery doesn't heal after it is injured. There are a couple of choices. You can put in an external (remote start) solenoid to take care of it, or install a starter that has magnets instead of battery-fed field windings. Mine cranks up nice, even when it's hot, with the permanent magnet starter motor. The remote start solenoid gives full battery potential to the hot solenoid, which has high resistance (as has been mentioned) due to the heat. Mine had a heat shield, but it was of little use in my situation. The truck would have to sit for some time, like an hour, before it would start again. I don't have that kind of patience, even, or maybe especially, when on vacation.