- 1978–1982 Factory-verified
THM200 (metric) standard from 1980
GM Heritage factory kit — 1979 Chevrolet Monte Carlo, p.132.
M38 / M29 / MX1 Factory-verified
Documented applications
This page aggregates every documented appearance of M38 / M29 / MX1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.