I use B&J trannys,same strength as Lenco.
We resuface the clutch disc and floaters every run!
Use to have portable clutch grinder that we took to the track, but it is not accurate enough.
Bought this 11K surface grinder to do the whole clutch assy including the pressure plate and flywheel after every race. We would put together enough clutch packs for the race before we leave the shop.


The clutch grinder.

All the fixtures to maintain your clutch.

Tool to check my work. It isn't cheap to run a clutch on the race track.