[AZKen]

Visually, if it's not burnt or scratched/gouged it should be OK. You can check flatness with a good straight edge to check warpage. I doubt if those big honkers warp. If it needs more than .020 taken off, a shim may be necessary. Hydraulic clutches will usually take up the small "gap". You can clean it and block sand it with emery. Let's see what others say. If your motor is out, you can mount it, turn motor by hand and check runout/flatness with a dial. Otherwise, if you want to be sure, take it to an honest machine shop for test. If it's flat within specs, not burnt and not gouged by a previous pressure plate, it's good to go. No surfacing necessary. When checking on motor, crankshaft end play will affect reading. Best to check off of motor if you can. Again, not too common to have to worry about. MAX runout = .009. Two issues: flatness and spacing. I realize you are asking about spacing after resurfacing.