Having problems with your 1991 GMC K1500 ?
1991 gmc 350 lifters not oiling - 1991 GMC K1500
If this vehicle has high miles, the camshaft timing gear nylon teeth may be breaking off and going into the lower part of the oil pan, blocking off the oil pickup tube screen. Oil starvation.
Repair Help & Product Troubleshooting for 1991 GMC K1500
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