A couple of important cam breakin tips:
1) use Shell Rotella oil with GM EOS.
2) Prime the motor before firing it.
3) Make good and sure that the timing and fuel systems are ready to go and fire the engine - if it doesen't want to start don't keep cranking it.
4) I use 2500 for 20 min's then stop, check the vlave lash and go again for 10 min's. The idea of more rpm is to get oil splashed up on the cam and lifters.
5) After 45 min's of operation I change the oil filter and cut the filter open to inspect it for debris.
6) I keep the same oil in the motor for 500 miles then change the filter and oil. Also check the valve lash.
After breaking in > 20 cams and some were radical NHRA stock eliminator cams ( read almost square lobes) this process has only let me done once and it was due to a bad lifter that would not pump up properly so it was basically smacking the cam.
