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GM flywheels are probably cast where a aftermarket could be billet. A cast flywheel is alot weaker and could if abused fly apart where a billet flywheel is far stonger and less prone to flying apart. An aluminum flywheel is nice but it is harder on the drive train. A motor is a series pulses and a heavy steel wheel smoothes them out where as a aluminum flywheel allows the pulses to be felt. The idle is also rougher with alumimun.
I did the "aftermarket" flywheel with a Hays flywheel. The first problem was with a Centerforce Dual Friction setup. The flywheel was only about 3/4" thick compared to the 1 1/4" thick for the GM flywheel.
Well after having problems with the centerforce, I was informed that I should of installed a "factory" flywheel (GM) rather then aftermarket and they almost didn't warrantee it. So I went with a Hays clutch setup and that seemed to work.
So I decide to get the M22, put it in, more clutch problems, (geometry was off and couldn't engage the clutch) place where I bought the tranny asked what flywheel was in, told him Hays, he told me to rip it out and put in stock GM. That's what I did, and I haven't had a problem since...
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.