Always use brass freeze plugs you don't want to pull your engine to replace a rusted leaking freeze plug. I clean each hole with a wire wheel on an air motor to make sure the surface is 100% clear of rust and clean metal. I then wipe it with lacquer thinner or brake cleaner to remove any contaminants. I then rough up the edge of the freeze plug with scotch brite. Then put a very thin layer of silicone on the I.D. of the hole in the block and the same on the mating surface of the freeze plug. I start the plug in the hole with a good size hammer then drive it the rest of the way with an aluminum rod working around evenly until it it's flush with the block. I know you may be thinking this is over kill but this is how I do it. The correct size freeze plugs for a Pontiac is 1-61/64".
__________________
Tim Corcoran
|