Can't remember who was asking about a double disc factory clutch but I found this article on it if anyone is interested.
http://www.camaro-untoldsecrets.com/articles/rpo_ma6.htm
Jim

It says that the dual-disc set up used a 14"-24.5 lb. flywheel.

Does a 14" flywheel fit in the 403 bell
housing?
or
Did the the dual disc set up go into a 621 bellhousing in a Z28 with the dual option?
or is there not enough documentation to even know?

69rad
You're right it does say 14" flywheel. I'm not sure about the bellhousing?
Jim

ReBuilt the engine in a 1971 Corvette Documented LT1 car about 10 years ago, and it also had the dual disc clutch. It used the small dia flywheel and small bellhousing. I can not honestly say if the bellhousing casting number was 403, but i do remember that it had the small dia flywheel. Hope this helps.