You need to turn the engine over very slowly to get the holes in the cam to line up properly with the holes in the cam bearings while the oil pump is supplying pressure to get oil through the hollow rocker studs. Unless you have a lot better luck than I do, neither the holes for lubricating the right nor left head will just happen to line up and never do both sides line up at the same time.
Somewhere on this forum Jack Gifford has a nice write up about this issue. I've been looking for 15 minutes and can't find it.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
Last edited by Bill Hanlon; 05-30-2023 at 12:17 PM.
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