General Motors — Stopping Engine
Operation
From a General Motors owner's manual covering: Carb 5.7L, MP 5.0L, MP 5.7L, MP 6.0L. Check it applies to your exact model before use.
Procedure
- Bring the throttle back to the idle position and ensure the transmissions are in Neutral.
- After the engine reaches idle speed, turn the ignition key to the OFF position.
- Allow the engine to idle at 1200 RPM for 3 to 5 minutes to cool down before shutting off the ignition after extended high speed operation.
- Turn the battery switch OFF (if equipped).
- Close the fuel valve.
- Close the seacock.
- Flush the cooling system if in a salt water area.
Source: General Motors owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.