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Originally Posted by KB ZILLA
All the motors I have built have been full throttle by the time they had 400 miles on them if not sooner. It works for me. 
I have only built about 15-18 engines, but I always change the oil at 500 miles and again at 1500 miles then at 3000 and every 3000 after that. |
When I built my 89. I had 100 miles on it and the builder told me that was plenty since it was a roller motor.
A roller cam and OHC motor has no flat lifters to wear in.
For initial break in on my 89 I did the normal 20 minutes at 1500-2000rpm. I also took it easy for the first 100, then less easy for the next 500.
The main thing with "break in" is the engine will loosen up(less frictional loss due to new rings/bearings) as well as become more efficient over the next 5000 miles or more.