starters keep getting to hot need help

I know I am not a typer by any means I got fat fingers , cant see outa 1 eye and im blind in the other I have a 1 eyed snake and a 3 legged dog and im short on both ends , but dammit I "m tryin . and oh don't put your hand in the gears when they are turning the chain or you will type like this tooo.
we got 1 hint to start 1 used starter on 1 new motor ,that came off a motor that used to over heat.
yes I have 1/2 inch ground cable to the frame to the bock , to the fire walls to the power while the starter wont turn is when its at 170 the lights are brite as can be even when I turn the key
nitro brought up the issue of the armatures cook out of the starters because I ran my 340 with a 3 core radiator that wouldn't keep it cool .
I got a new alium radiator that kept it kewl today at 170 sitting still n 1 1/2 hours during breaking sessions .
I might have stepped over a dollar to pick up a dime with using a used starter on a new motor. theres a little more info keep your opinions coming .
and turn on the crash fest for a million dollars dam I need a sponser and 15 mechanics and a credit card with no limit