My '57 347 GMC (Pontiac) V8 ran about those pressures for 22 years and over 130,000 miles of daily driving. Maybe down to 10 PSI at 500 RPM idle in really hot weather with the A/C going.
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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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