I need starter help!

[vexvader]

I have a 1970 C10 with a basically stock 350. I only drive about 1000 miles a year on the weekends.

Here is the problem...

Every six months I have to buy a new starter.

It works great for about 4 months and then all of the sudden it won't crank the motor once it is hot. After three new Auto Zone starters I bought a Summit high torq starter, wrapped it in a starter insulation kit and it worked for about a year and now it is doing the same thing.

I do NOT have headers and the battery and cables are good. Every time I put a new starter on it cranks right up every time for about six months.

Please help!!!
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