I have a 69 Z, 021 flywheel, 403 bellhousing, M20 trannie. I need a new clutch. Do I need a 10 1/2 or an 11? Which is better, a borg and beck, or diaphram, and what kind would you folks recommend?

The stock clutch size for a Z is 10.5 inches. As for what type of clutch to run it would help if you let us know how you use the car, what HP you have (motor stock or modified?) as well as rear end gearing and tire size/type.

Victor

67 vert
W 2LG 3L 4P

It is a stock 302 with headers. 373 rear gear. Use it on weekends to play. I do have a heavy foot with it and jerk it around a bit - just can't help myself.

Based on your usage, I'd go with a 10.5" Centerforce II, or a DF if you're really going to hammer it. :)