I've been playing around with it for awhile now. Always optimistic in my opinion. Get a chassis dyno (DynoJet) and see what it does. 75% is what I would expect for a C-4 driveline efficiency. That means divide the DynoJet figures by .75 to get estimated flywheel numbers.
Rev.
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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