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Stock new the valve covers and oil pan had orange GM silicone sealant w/o gaskets. It held up well until it started leaking many years later. I still use gaskets and Permatex The Right Stuff on all gaskets I replace on the engine. Great results. If you are impatient while you are waiting replace...

I don't know what this means. I am out of my league. They either work or they don't. I never tested them with an ohm meter. Hot wire and ground them. Puff the smoke rises immediately.

Did anyone suggest removing the glow plugs to get the motor spinning freely during your attempts to bleed the fuel system? It spins 20 times faster and purges the air in less time and strain on the starter and batteries. It is 20 minutes more work. But so is changing a burnt out the starter and...