Starts hard when hot

Discussion in 'Troubleshooting & Diagnosis' started by tbrostrom, Feb 23, 2018.

  1. Gary S

    Gary S Administrator Lifetime Gold Member

    21,442
    412
    Apr 14, 1999
    Bismarck, North Dakota
    The old GM high torque starters that had cast iron noses that I've seen were all staggered mount for the large flywheels. They were needed to fit the 621 large bell housing.
     
  2. 70copperZ28

    70copperZ28 Veteran Member

    188
    5
    Sep 11, 2005
    Pflugerville Texas
    I went with a Powermaster 9600 on my 70 Z since I have headers and the cam likes a lot of initial timing. The original starter wouldn’t cut it once the engine was warm. It spins it like a top now!
     
  3. rocket dawg

    rocket dawg Veteran Member

    260
    14
    May 5, 2015
    Grand Rapids Mi
    I always have to original starter rebuilt. They fit like a glove and mesh right. Never had any luck with reman starters, especially fit. Shimming didnt help either.
     
  4. Gary S

    Gary S Administrator Lifetime Gold Member

    21,442
    412
    Apr 14, 1999
    Bismarck, North Dakota
    There is some very good information here about Chevy starters. The first picture shows you the difference between the low and high torque starters. You don't want the low torque version unless you are running a 6 cylinder or a very small V8. Big engines will crank easily if you have the high torque starter.
    http://rmcavoy.freeshell.org/starters.html
     

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