Kevin
Go to the nearest Checker's, Auto Zone, WalMart or what ever and get yourself
a compression checking tool/gage. They come in two styles...low cost cheapie
you must hold it in the spark plug hole with force and the more professional
style which screws into the spark plug hole. The directions are on the box.
Your local HS has one in the shop. Ask.
Rodger & Gabby
47 De Soto Custom
63 Le Baron
66 Le Baron