350 4-bbl high compression (Rallye 350 engine)

Years 1966–70, 1972 Models 2 Factory citations 1

Also described as High-compression V-8 (425 4-bbl in full-size)HC 350 4-bbl455 4-bbl (B-body)

Documented applications

Cutlass / 4-4-2

1970 Factory-verified

Factory list: "Engine Option — 350 Cu. In. V-8 H.C. 4-Barrel"

GM Heritage factory kit — 1970 Oldsmobile 442 Info Kit, p.229.

Full-Size 88 / 98

1966–67 Confirmed

Delta/98
1968–70 Confirmed

—
1972 Confirmed

Code reused

This page aggregates every documented appearance of L-74 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.