Just finished buttoning up my 273. I used Mr. Gasket head gaskets because they displaced the fewest CC's. The factory steel shim gaskets are no longer available and I didn't want to kill my compression any more than necessary. Like a couple of other posters on this board using these gaskets, I have instant water leaks. Now, this ain't my first engine by a long shot, so I know that it is the gaskets. Having said all this, and using every choice word that I can think of directed to Mr. Gasket, can anybody tell me what the head gasket specs are for the Fel-Pro QKS2108 available at Summit? supposedly for 273-318 only.