S&S 107 kit cylinders.

[838]

Can these be bored at all?

[Ohio HD]

Are they S&S 3.927" or S&S 3.937"?

3.927" bore +0.010"

3.937" paper weight

[Don D]

Sure no problem.
Pistons are KB714lca, in stock.
106 S&S is 3.927 and will allow the overbore.
I would not bore bigger than 3.937 with stock or S&S barrels with cast liners.
I have taken the 4" steel liner barrels .005 OS

[Ohio HD]

These could also be S&S 910-0500 which are 3.937", and is a 107" and can not be bored. That's why I asked to clarify what he has. He stated a 107". The 3.927" is a 106".

[Hillside Motorcycle]

We have bored/honed several sets, using our #HMM1070 piston/gaskets kits, J&E forging.
That coated piston skirt measures 3.935" a-typically.
Puts those back in service.

[Bafflingbs]

Why not just go 110"? S&S and HD cylinders are thin, but strong. I'm glad I went with it.