I used one of those expandable plugs years ago and it worked fine. On my present 216 I have a replacement oversized plug that cut new threads. It seems to be doing the job too. On my last change I replaced the washer with a new copper one and I didn't have to tighten it as much to get a good seal.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!