Big issue with freeze plugs,soft plugs, and coolant pressure we all should address
Here is Opie's (Intelligent Engineering) kit installed on my 05:



There are other advantages of installing this kit besides relieving pressure. It also helps the coolant flow in cylinders 5 and 6. Not all the kits help this BTW.
Paul



There are other advantages of installing this kit besides relieving pressure. It also helps the coolant flow in cylinders 5 and 6. Not all the kits help this BTW.
Paul
I recently lost my freeze plug in the rear and got the kit through enterprise for $163 delivered. It was sweet too. Machined plate with an O-ring in place of the plug. Had threaded hole in the middle for the outlet which was 5/8 hose and a pressure relief valve that I set to 17 lbs and the tee's back in to the top radiator hose. The service was perfect and the quality was outstanding. It can be put in without even dropping the down pipe. Just lube the o-ring and push it in. Then three flywheel size bolts which were actually pretty easy to get to with a gearwrench. Lucky for me the freeze plug blew all the way out. The hardest part will be getting the old plug out. One less thing to worry about was worth the 1/2 hour install. Good luck getting the plug out though.


