Quote Originally Posted by jap_racer1
ok i am the guy that has all the posts about the gsr build stock valve the super highcompression well i rebuilt it to a 82 mm bore with nippon racing pr3 copy pistons je rings and acp race bearings complete rebuild crank up the head is gsr valves type r springs titanium retainers and type r cams nothing special?? how many miles do you feal i should go for a good break in before i hit it hard i am getting it tuned thursday and running on wendsday commerse is have the tune fest w/e friday and i would love to run it so what should i do??
the proper way to do it is this

Crank car up, let it run for 20 min at IDLE. Check for coolant leaks/oil leaks. After 20 min and the car has reached operating temperature, shut car off.

Drain and replace OIL AND FILTER.

Crank car up again, SLightly Rev it to 3000rpms, 4000,5000. Let idle, check for coolant leaks /oil leaks AGAIN.

After that, tow the car to your nearest dyno and have the car tuned and broken in ON THE DYNO.

If you do it ANY OTHER WAY you are risking the money you have just forked out. The rings will seat in the first 100 miles, usually in the first 50. you need to vary load and get a good a/f ratio so as to not cause any damage to the bore or the rings.

If you do it this way you ensure good ring seal, good a/f ratio and a healthy motor.

Breaking it in EASY is a myth, and its the wrong way to do it, driving 500-1000 miles on it before tuning or whatever is WRONG. Think about it, you really wanna drive it 500-1000 miles on an air fuel ratio you have no idea if its lean or rich?

Not smart.

Break in should always be done on a dyno, or at least by a competent tuner on the street.

Good luck