Matt 5/2/2010

1987 GMC R1500 Sierra Classic 8Cyl5.7L - Engine

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350 tbi with 148,000 just started tapping or a slight knock on the bottom end is where it sounds like it is coming from

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  TrashFormers ( 12/7/2010

  nid valve adjasment.........too mch clerance.................(",)...............u

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  J and K AUTOMOTIVE TOWING AND REPAIR 12/7/2010

  hey matt you can try to redo your valves but i see that you have alot of miles148.000 and a slight knock if i was you i would be planning on rebuilding the motor..............good luck

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