If Rings Don't Seat:

[Jerry Clayton]

You can sprinkle Bon Ami powder into the carb intake while running---it has been used on some difficult to seat rings many times in previous decades------------

[DAVID GAGNARD]

Originally Posted by Jerry Clayton

You can sprinkle Bon Ami powder into the carb intake while running---it has been used on some difficult to seat rings many times in previous decades------------

I have done this myself a time or two,I know of some drag racers that used to do this on all their engines for quick break-in/ring seat as they couldn't very well drive the cars on the street for break-in.....

David

[jhv48]

I considered it as we'll, but the engine builder about popped a vein when I suggested it to him. Got to keep the warranty in place. Right now he's ready to tear it down and hone and ring it again.

I'm going to try to break them in one more time, using David's method. If that doesn't do it, then it's coming apart.

[Turbonut48]

My 418W took almost 1500 miles to break in, and stop using break in oil.
And my builder didnt want me to change to regular oil until 2000 Miles.
Good Luck.
The Nut

[ERA Chas]

Originally Posted by jhv48

Right now he's ready to tear it down and hone and ring it again.

Pay attention to ring selection. No low tension. A finished Ra of 15 - 20 for Moly, 20 - 25 for Chrome.
If run-in on a dyno, 20 minutes at 2500RPM, 3 or 4 pulls to 5K or so under load. !5W-30 or 15W-40, no synth. Try to use a System1 filter.