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Technical HELP. Sbc rebuild starter won't spin motor

Discussion in 'The Hokey Ass Message Board' started by Trace jarvis, Aug 14, 2018.

  1. Trace jarvis
    Joined: Aug 14, 2018
    Posts: 7

    Trace jarvis

    I rebuilt a 75 sbc 350. When assembled spun well. When plugs are out spins with starter but a bit slow with plugs in won't spin enough to start. Very slow what do i do
  2. Torana68
    Joined: Jan 28, 2008
    Posts: 1,128

    from Australia

    Any oil in the bores? What’s the voltage at the battery? Voltage at the starter?
  3. Terrible80
    Joined: Oct 1, 2010
    Posts: 723


  4. Oilguy
    Joined: Jun 28, 2011
    Posts: 353


    I had that issue recently with a rebuilt starter from a large chain store. Problem was an internal ground wire improperly soldered. I took it to an auto electric shop to check it out and the wire fell off in the mechanics hands.
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  5. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 4,848


    How large and long are the battery and ground cables you are using, and where are they connected.
  6. 302GMC
    Joined: Dec 15, 2005
    Posts: 5,898

    from Idaho

    How does it feel (plugs out) when you turn it by hand ?
  7. BigDogSS
    Joined: Jan 8, 2009
    Posts: 814

    from SoCal

    Get a late model permanent-magnet (aka: "mini-starter). Brand new, ACDelco from RockAuto for about $100.
    --Straight bolts --> 1996 Caprice w/LT1
    --Staggered bolts --> 1998 C1500 w/Vortec 5.7
    We've done this conversion about 6-7 times with no issues.
  8. Starting a fresh mill or one that hasn't ran in years is often a chore for the starter system. Even componets in tip top condition are often taxed to their limits. I always hook up my large battery charge on boost to help. Sometimes I remove all the wires from the starter and hook up two batterys 24 volt just to the starter to getthe engine fired off the very first time. Usually after the 20 minutes at 3000 RPM break in the engine will be easy to turn over and start.
  9. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,103


    No what some self style experts say those skinny little battery cables that are sold for 12 Volt can't carry the amps that you need when the engine takes some extra effort to crank it over. Found that out on my ot truck.

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