Originally Posted by Dougie
Small Block Chevy 168T flywheel drilled for 10.5" clutch. I got this and an almost new clutch and pressure plate with a muncie trans I bought. Cleaned it up and gave it a quickie surface job with a straightedge (1x 2 aluminum bar ) and 150 grit paper. Very little effort to make it look beautiful. Only problem is two small areas (largest is about 1"long by 3/8" wide) on opposite sides of the wheel on the inside edge where the clutch would ride closest to the center. They don't look burned but you can see them and feel them with finger. They are deepest on the inside of each. Putting a straightedge across them in the dark I can see a very small amount of light from a flashlight, but I don't have a feeler gauge small enough to slide in and measure the depth. I tried to slide a piece of paper (.0035") and it didn't come close to going in the gap, so I'm guessing the depth of these areas to be on the order of less than .002". What do you think about running it this way with a new clutch and pressure plate (I'm not gong to re-use old ones)? This strictly a street car with a mild 327.
If the flywheel is used and you are installing a new clutch and pressure plate, resurface the flywheel. It's less because of any small defect- it's because the right finish needs to be on the 'wheel in order for the clutch to hold properly.