sorry i forgot to add this but the head was bought from ur-gelis (restored) on ebay. From that, the guy i bought the head from installed a schneider stage 2 cam with adjacent lash pads. My guess is that the rear valve was not addressed and he might have installed the shim on accident... well i spoke with him and we're trying to get this settled. As of now with that one shim, the cam rotates freely without bind. However, i have never heard of having just one cam tower shimmed.:devious: