1987 S10 developed a nasty squeaking noise. Pulled off left bank valve cover to find #4 intake rocker arm dry. Removed the rocker arm & pushrod, and checked for plugged pushrod. Pushrod was ok. Reassembled & started to check oil flow. #2 Exhaust flowing ok as is #6 Exhaust. Everything in between either is barely flowing or, no flow. What could be causing this? Engine carries about 40 psi oil pressure.
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2.8 Insufficient oil to rocker arms
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