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dwcsr · 01-02-2014, 12:02 PM

GM had a brain fart and used metric plugs on some engines. I think its a 16mmx1.5 or 18mm x 1.5 pipe plug not straight thread

01-02-2014, 12:02 PM	#8
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,131	Re: 350 Block Question GM had a brain fart and used metric plugs on some engines. I think its a 16mmx1.5 or 18mm x 1.5 pipe plug not straight thread