I installed a set of Andrews 54 cams, and S&S premium lifters in my 15 RGS. I pulled the spark plugs, and spun the engine with the starter a little, in the hopes of pumping up some oil pressure for the initial startup. When I hit the starter, it sounded like I had spun a rod, so I shut down immediately. I waited a minute, hit the starter again, this time it was quieter. I assume that there was no oil, or pressure in the pump. For the first 5 or 10 minutes of running the engine there was top end noise, sounding like the lifters were not pumping up, which steadily decreased, until it quit making noise.It appears to sound normal to me now. Is this normal when doing a cam install? Should I worry about possible damage? This was my first cam install, so I am a little uncertain.