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Run the motor at 2000RPM and above alternating RPMS for at least 20minutes. This is to break in the cam and seat the lifters to it. By alternating the RPM's above 2000 you create greater oil splash helping to make sure you don't have a dry lobe. If you don't do this you will grind a lobe or 2 off cam normally. Immediately after cam break-in I go and change the oil&filter ( you get alot of metal in oil breaking in cam. Then I recheck everything for proper timing, fluid levels and leaks and go for a 200-250 mile drive. Try to stay out of town and alternate RPM's on drive as much as possible. I then change my oil again after 250 miles. Then drive it normalchanging oil again at 2500 and 5000. Once I hit 5000-10,000 miles I consider the motor broke in and ready to be thrashed to see what performance gains I have made at wide open throttle.
Oil changes at 2500-3000 miles for the rest of the motors life and not over revving and causing valve float will help to insure that you get 200,000-250,000 miles out of the motor.
GMCPaul
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