Oil, Fuel & Cooling Pressures

Typical operating and test pressures for classic engines. Always verify against the factory service manual — these are general guidelines for healthy systems.

SystemTypical PressureNotes
Oil — hot idle10–25 psiRough rule: ~10 psi per 1,000 rpm
Oil — 2,000 rpm (hot)35–65 psiMost stock OHV V8s
Fuel pump — carbureted4–7 psiMechanical pump; excess floods the carb
Cooling system cap13–16 psiRaises boiling point ~3°F per psi

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