Weird noise
08-26-2004, 03:40 PM
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Location: Kingfisher,Ok
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Car: 97 WS6 T/A
Engine: LT1 383
Transmission: 4L60E
Weird noise
The motor is a high mileage freshly rebuilt 350 out of a 90 1/2 ton pick-up.
We installed it after replacing the rings ,bearings, oil pump, cam and lifters, and having hte heads freshened. We put the stock 86 TPI equipment on it and has ran like a charm for a while. The motor has excellent oil pressure and compression check shows 110 psi average (the lowest being 102 psi).
Lately we noticed a weird noise it was making wether in or out of gear. When you stop the gas suddenly it gives an audible double knock. At first I thought a rod bearing or wrist pin, but after messing with it and looking it over I am stumped. the oil pressure remains rock solid, and if I bring the rpms up slowly no noise is present. I put the car on jackstands and had a freind work the throttle from above, the noise is in the very back 6 inches of the motor towards the bottom.
Car still has plenty of power.
Any ideas?
We installed it after replacing the rings ,bearings, oil pump, cam and lifters, and having hte heads freshened. We put the stock 86 TPI equipment on it and has ran like a charm for a while. The motor has excellent oil pressure and compression check shows 110 psi average (the lowest being 102 psi).
Lately we noticed a weird noise it was making wether in or out of gear. When you stop the gas suddenly it gives an audible double knock. At first I thought a rod bearing or wrist pin, but after messing with it and looking it over I am stumped. the oil pressure remains rock solid, and if I bring the rpms up slowly no noise is present. I put the car on jackstands and had a freind work the throttle from above, the noise is in the very back 6 inches of the motor towards the bottom.
Car still has plenty of power.
Any ideas?
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