The Autolite 3924 spark plug typically requires a 5/8-inch (16mm) socket for installation and removal. It's important to use a spark plug socket that has a rubber insert or magnetic tip to help hold the plug securely while working. Always ensure the socket is compatible with your ratchet or wrench for proper leverage.
Autolite 258
18 mm spark plug socket
5/8" peanut plug socket
You need an 18 mm spark plug socket.
The cross-reference for the Champion plug RA8HC to Autolite is typically the Autolite 3923. When replacing spark plugs, it’s essential to ensure that the specifications, such as heat range and thread size, match your engine's requirements. Always consult a vehicle-specific manual or database for the most accurate information.
Autolite lists it as 2976 or SE2976DPT. I haven't installed the plug yet so I can verify.
16mm
Its a 28mm socket.
You need a 5/8" spark plug socket.
size 20
24 mm socket
a 5/8 socket