1988 chevy 5.7runs fine but has werid knock in bottom - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-22-2011, 10:08 PM
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1988 chevy 5.7runs fine but has werid knock in bottom

hi i have just put in a new 350tbi in my 88 stepside the motor came out of a 90 gmc 4x4 it ran great was sitting around for a few months , it ran fine but i put it in my truck and it runs good but has a knock and like a pinging sounds from the bottom i have took off the fly wheel to see if it was cracked but to find nothing it runs great no power loss do sent smoke runs great just this knocking sound from the bottom near the oil pan please help me out this is my third motor that s been nothing but problems thanks

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Old 06-22-2011, 10:19 PM
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since you took out the trans/flywheel, did you run the motor without the trans hooked up?
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Old 06-22-2011, 10:24 PM
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that was my next step what would u think it is?
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Old 06-22-2011, 10:56 PM
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There are only a couple things if it is bottom end. Once the trans is out of the equation, that only leaves a rod
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