Ray-
That 1/8" is for clearance of the coating itself. They are much thicker than paint, so if you mill your parts to fit tight, they wont open and close when your finished.

-Dave D
Reservoir of Useless Knowledge

"But... If I kill all the golfers, they'll lock me up, and throw away the key..."
-Bill Murray

'84&change Monty MPI Turbo, choptop, f&r lsd, swapped in AT- All the goodies!