How do you test my compression on 351 Windsor engine?

To test the compression on a 351 Windsor engine, you'll need a compression gauge. Start by removing all spark plugs to allow for easier cranking and ensure accurate readings. Crank the engine for a few seconds while holding the throttle wide open, and record the pressure reading from each cylinder. Compare the readings; significant deviations between cylinders or readings below the manufacturer's specifications may indicate engine issues such as worn rings or valve problems.