welp, disregard this whole thread, i was misinformed.......the stock compression ratio is 9.4:1 according to a chilton manual.......wonder where all that knock was comin from???pulled the motor apart yesterday.....everything inside looked good...been runnin a lil lean, all plugs were white as can be....maybe it was a lack of fuel issue HMMMMMMMM????somethin to do on my days off