H/O 350 drivetrain designation (Rocket 350 + TH-350, "W-25" fender decals)

Years 1970–71, 1974–75 Models 1 Factory citations 2

Also described as Forced Air Induction fiberglass OAI hoodOAI fiberglass hood (std on W-30)

Documented applications

1970 Factory-verified

Optional on 4-4-2/Cutlass; standard on W-30/W-31; own stripe pattern; factory list: "Force Air Induction System… Included in W30 & W31 Options… Includes Special Hood Paint Scheme"

GM Heritage factory kit — 1970 Oldsmobile 442 Info Kit, p.231.
1971 Factory-verified

4-4-2/Cutlass; factory list: "Force Air Induction System… Included in W30 Option… Includes Special Hood Paint Scheme"

GM Heritage factory kit — 1971 Oldsmobile 442 Info Kit, p.225.
1974–75 Confirmed

1974: 1,995 H/O total; 1975: 2,535 (1,324 × 350) — note: same code as the 1970–72 OAI hood, different meaning

This page aggregates every documented appearance of W-25 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.