My guess is he figured out the percentage of the V8 Camaros in 74 (79835) that came with the M21 (3336) which is 4% and applied that to the number of Z28's made (13802) and out pops 552. That of course assumes that it is an equal proportion of Z28's got the M21 as compared to the entire production of V8 Camaros. Flawed logic. My guess is more Z28's got a M21 than V8 Camaros. Maybe much more. Especially since a regular V8 Camaro couldn't even be optioned with the M21 Muncie but the M21 option got you a 4 speed Saginaw and a Z28 was much more likley to get a 4 speed than a regular Camaro for obvious reasons.
I would offer that about a third of Z28's probably go the M21. No data to back this up but just based on how many I have seen at shows and for sale etc.
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
Last edited by BCreekDave; 04-23-2019 at 03:17 PM.
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