Originally Posted By GoodysGotaCuda
I believe it was mentioned here, but just go ahead and tap that nipple for 1/8" NPT and put a real pipe plug in it. Then use the dorman cap just for the aesthetics of a finished edge. I ran that on my 318 for at least 7 years.


Well I thought that I would take your advice and do just this. The problem is that I pulled out an old water pump to do a test fit with the 1/8" NPT tap. It drops right in.

Did you mean to use a 1/4" NPT tap?

1972 Cuda 340 4 speed, 2001 Ram CTD 4x4 6 speed, 1970 Duster 408 4 speed, 1996 Ram 5.9 2x4 auto, 1965 Coronet 500