hidden plug thread size
 

hi guys just had my 455 cleaned and I need a new plug. after I clean the gallerys more. what is the size and a good place to get one. thanks, chuck

3/8 pipe thread- this one is drilled to provide positive lubing to the distributor gear: https://butlerperformance.com/i-2498...pio-pp475.html

thanks grivera, great info answered both questions.

you're welcome