Originally Posted by bjuice

the break in procedure does many things ..seating the rings is one of them.
i have personally whitnessed brand new motors being dyno tested for the 1st time thru clements racing in Spartanburg S.C. and here is what i saw with my own eye's.

started up motor brought up to temp oil and water...shut it down. took valave covers off and DID a visual of rockers and valve springs...

2nd pull- started motor and turned the motor up to 5500 rpm and and let it run motor for abut 2 minutes. (seemed like 2 hrs) it wasn't my motor and i was a nervous wreck..but the guys operating the dyno was cool as a cucumber..they do this a-lot..

3rd pull --adjusted valves and found the max hp (approx 7200 rpm) on the motor and shut it off..

4th pull played with timing and carb jetting and pulled the pants off the motor again...fine tuning for HP....I think a total of 9 dyno pulls were performed..but this was fine tunning for max hp..jetting ,timimng,valve adjustments...etc...