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View Full Version : Oil Drain back size

fc227
02-23-2004, 11:13 AM
I have to drill a hole in in my "1979" block for a oil drain back for the turbo on the GN. Does anyone know what size it is? and is it tappped?
sumnerw
02-23-2004, 02:26 PM
1/2" NPT

Buzz White in Houston, TX
fc227
02-23-2004, 04:56 PM
Thank you
fc227
02-24-2004, 07:08 AM
Since I'm installing the 79 block in my GN, there is no hole for the oil drain back. I found out that is 1/2" NPT (thank you Buzz), but now the question is was size and tap size of the knock sensor? I want to weld a bung to the back of the block but I need to know what size. Any ideas guy's?
sumnerw
02-24-2004, 02:24 PM
1/4" NPT

Buzz White in Houston, TX