Black M Code GTS at Mecum

Since M-codes only came with auto’s, I’d imagine there were people that swapped them for 4 speeds very early in life.

I know of a 70 396 Camaro SS that was dealer swapped out for an 454 LS6 motor 2 months after purchase. Column auto A/C car.

NS1RM23 here bought it from the widow. We couldn’t figure out why it was so original and dated looking but had non numbers swapped motor.

Months after he sells the car, window finds and mails over paperwork with extra keys. Lots of paperwork. Had dated notes of conversations with GM reps prior to purchase. And specifically mentioned the Hot Rod magazine article that suggest the swap with part numbers. Had Invoice from dealer for swap. Even had a expensive corvette AM/FM multiplex radio installed.