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Re: starter motor
Geezer#99 pretty well nailed it on all three counts.
You have to have the correct GM starter bolts.
It truly needs the brace from the extended bolt on the other end of the starter to the block to keep it from flexing and bouncing.
If the timing is off and the engine backfires or kicks back it can do that.
I just went through 2 and 3 with the Cadillac 500 I put in my 71 GMC and ended up with similar results and had to buy a new starter endframe.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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