In a message dated 6/18/04 9:21:42 AM US Mountain Standard Time, ChiefTAM@aol.com writes: > I pulled into the parking lot at work > and as I reved the engine above idle, I could hear a knocking, sounding like > it > was coming from the center of the engine. > Todd, I'm with Joe. Sounds like an upper head stud turned too far into the crankcase so that the rod is hitting it. Regards, Bob Helt