I have a 1984 D-100 p/u truck w/ 318 engine. Was able to remove the engine block coolant drain plug w/o breaking it, however; the threads are very marred up. Surely I'll need to rethread the block's drain plug hole & put in a new drain plug. Does anyone know the thread size? Thanx.

 

Welcome to DF.

First, before anything else, please read this:
https://dodgeforum.com/forum/dodge-ra...s-section.html

I will move this to the 1st gen section for ya.

 

Link don't work.

 

The plug is a standard pipe thread.

That page is a quick read but I didn't get much out of it. "Page not found" LOL