Starting on page 6A4 of this 1957 Pontiac shop manual https://www.pontiacsafari.com/57/Sho...%20Cooling.pdf you will find Pontiac's (instead of GMC's) explanation of early Pontiac V8 oil distribution. The camshaft and rocker arm info is on page 6A5.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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