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.
| System | Typical Pressure | Notes |
|---|---|---|
| Oil — hot idle | 10–25 psi | Rough rule: ~10 psi per 1,000 rpm |
| Oil — 2,000 rpm (hot) | 35–65 psi | Most stock OHV V8s |
| Fuel pump — carbureted | 4–7 psi | Mechanical pump; excess floods the carb |
| Cooling system cap | 13–16 psi | Raises boiling point ~3°F per psi |