Rebuild Break In

[Sieg]

I just had my 355 Gen 1 motor freshened rings, cam, bearings. I was going to do the 20 min 2K rpm break in with open headers.

1) I've had a couple people say no way because if there is something wrong with the motor you won't be able to hear it.

2) With brand new ceramic coat Doug's headers I was thinking they may not discolor as bad with less back-pressure.

Opinions please.

Hooking the exhaust up could cause a week set-back in the schedule.