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#11
11-04-2015, 12:51 AM
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I knew I had read that somewhere. Just looked at the Pontiac Tri-Power road test that Hot Rod Magazine did in their June 1957 issue. It uses the exact same drawing as figure 85 in my previous reference, but the text that points at the port says "INTAKE VALVE VENTED TO ATMOSPHERE" and the text under the drawing is as follows:
"Cutaway drawing from factory manual shows how the intake valves are vented to the atmosphere through the side of the head casting to prevent excessive oil consumption. Instead of oil being pulled down guides under high vacuum, air bleeds through."
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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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