Big block chev thrust bearing problems

Discussion in 'System One Pit Buzz' started by Bob sherry, Aug 12, 2016.

  1. Bob sherry

    Bob sherry New Member

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    I have started to damage my thrust bearing on my big block 469 cui engine after 4 years of racing and 168 runs . It's a 750 HP 469cui with a power glide trans , the car runs 9.1s at 149 mph and weighs 2825 lb. I caught the problem before it damaged the crank so I just polished the thrust while still in the engine fitted new bearings and put it on the Dyno. Everything checked out good so I raced and won the next meeting . It did it again, went through the same process again but this time I lowered the cooler line pressure from 150 psi to 95 psi , pressures were taken while on the trans brake . Raced the car did well but wore the thrust again . Can anyone help ?
     
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  2. pulltab

    pulltab Member

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    I would check your converter for ballooning. This happened to me on a blower motor years ago.
     
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  3. pete9857

    pete9857 Member

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    or possibly a cracked flexplate, but i'd go with the convertor issue
     
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  4. Bob sherry

    Bob sherry New Member

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    Converter still measures ok but some times I wonder if it could balloon and then retract back again.
     
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