[RICK LAKE]

Old dog Try pipe sealer. It comes in a small blue apply bottle. Let cure for 24 hours. If you are going to use Alum plugs, use anti seize on the threads. This will allow you to remove the plugs down the road. It also acts as a sealer. GM sells sealant tabs. Come in a 6 pack. Try these, We use them on Caddie for the last 20 years. FOLLOW the instrutions. Let car sit over night then run. Go back to 15 psi cap. Rick L.