I do the same as Mike G. for about 3 heat cycles. Drain the oil and put in what you want to run. Far as I am concerned its ready to go. To me the heat cycles are the most important part of the break in. Taking the metal from dead cold to about 250 degs. and back to cold is the only way to seat the rings to the cyl walls. If the bearings have the proper clearance they are ready as soon as they have good oil flow. To get the heat in the motor you will have to block off the radiator some to get the heat up to 230/250. The first heat cycle in done in the shop after start up during cam breakin at 2000 rpms for about 20 minutes...SCRAP
