Well I decided to tackle my leaky core plugs today. Went to napa to get some expandable rubber core plug, trying these due to time constraints, they list them but have 2 different sizes. Got the anti freeze drained and waiting for the beasty to cool off, got the burn on my arm to prove it's hot lol, does anybody know what size the plugs are on on the block under the head on the exhaust side of the block ? Thanks !