Thanks for all the replies. Monte and Don, I guess I may have not stated the 500 miles correctly. I did 2 seperate 20 minute break in sessions at various RPM's. Then put the inner springs in and changed the oil. Then Nick told me to run it for 500 miles before the next oil change, still with the break in oil. All that was his procedure he wanted me to follow, and that unfortunately is where it ended. He was supposed to e-mail me the specs but never got to it, so I dont know all the clearances. I already took it down the track a couple test times and he was good with that after 50 miles. So the 20W50 is too heavy even for hot summer days and track time? It does hold good pressure, about 60. I do appreciate the help as I am just trying to keep the motor together for a long time.