A thought on exhaust Cont.

The paint strip method is an acceptable method of determining stack length in the absence of dyno testing. It would certainly be better than just guessing at a random length, in the manner that you are using a consistent method.

The paint stripe method would tell you a point when your exhaust stream is losing heat content (energy) and therefore would start to become a restriction. The problem lies in using the "right paint". Different paints may burn at different temperatures, which would result in different stack lengths. Even if consistent paints were used, the application under which the paint was burnt may yield different stack lengths, ie: running an auger versus 30 minutes on a dyno, etc. It certainly would not be scientific, but again maybe better than just guessing...?

I have heard of this method before, but I was told to use barn roof silver....

Goldsburg

Painting a line down the pipe is a shade tree method of figuring out how long the pipe should be.

I saw a picture of Bears 880 pulling with about a 3 foot stack at about 3" O.D. Not a 5 or 6 inch piece if high dollar chrome. My guess is there is a definite reason for that.

Was Jack disqualified. If so then he deserves it.
Why mess with something that isn't broke. Sounds like he wants a few more rpms and isn't accounting for temp changes or something else. Greedy!

But if i paid what he did for that tractor i would probably sleep with it.