Ok here it is straight from the Motors auto repair manual troubleshooting section. High oil pressure: 1. oil pressure guage defective 2.oil too heavy 3.oil pressure relief valve adjustment too heavy 4. relief valve spring too stiff 5. oil presure relief passage clogged 6. plunger type relief valve stuck by gummy oil or plunger is too tight a fit 7.main oil passages on pressure side of pump clogged Looks like the most likely culprit is the relief valve.
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