icanfixall
Official GMM hand model
6 years ago the rear plug at the filter head costs me nearly $300.00 to have done. And I supplied the plug and the coolant. I had my engine out for the next set replacement and I used some JB weld as a tack weld in three places around the plugs. these concave plugs are a horrible item to install properly. You can't tell if they are in good and tight... till you drill a hole in them and pull them out... Whats with that.