Not Ranked
With a big-inch engine and light car such as the Cobra, go with an aluminum flywheel. The only place a heavy flywheel will do you any good is acceleration from a dead stop and that will be negligible. A rougher engine won't result as engine pulses are damped by, guess what, the crankshaft damper.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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