case boring what all is done when you have that performed? i saw a piston kit that said must have case boring done? i need some schooling thanx in advance.

 

With your bike coming with a stock 96", anything over 107" would need case boring. They literally bore the area of your cases where the pistons come through to accomodate the larger diameter.

 

We have been boring cases for over 20 years.
The cases are split, and set up in a vertical mill, on a 90* precision angle plate, machined just for that application, square with the quill, and indicated dead nuts on center.
If using an Axtell 4 1/8" cylinder, a 2 step boring process then is established, and the dimensions are held to their exact specs.
Once that is completed, the center hole is then machined thru to the lifter side, and their proprietary hardware is then used.
Usually what follows that, is also a Timken bearing conversion in the left case half, as long as the crank is running true.
Scott

 

and it don't cost that much to send your cases to New York either... :^)

 

thanx guys for the information.. i understand now.

 

Remove and disassemble engine.

Gut the block and reassemble the 2 halves.

Mount in milling machine, level, and center on the case bore.

Chuck up proper tooling, cut to desired diameter.

And as mentioned, a second step cut is done where necessary.

A twin cam A block goes like this.

 

Those cases look MIGHTY familiar.

 

That's where mine are headed come Monday morning.

 

couldnt you just shorten the piston skirts and save a lot of time?

 

No, you wouldn't have any skirts left. The factory has taken the o-ring out of the new cases around the locator dowells so we no longer step bore the cases.