Force-Air 350 CID package, 325 hp ("Ram Rod 350" in 1968, ~501 built)

Years 1968–70 Models 1 Factory citations 2

Also described as OAI 350 package, 325 hp, aluminum intake (new for 1970)— dropped after 1970

Documented applications

1968–70 Factory-verified

F-85/Cutlass, NOT 442; black inner fenders; manual brakes only; 1969: only year of W-31 convertible (26 built); JO-code TH-350 automatic added Oct 1968 (per Olds marketing bulletin N/C 68-17); 1969 factory service list: "Air Induction System (32, 36 and 4200)"

GM Heritage factory kit — 1969 Oldsmobile 442 Info Kit, p.247.
1970 Factory-verified

F-85/Cutlass; 1,352 sold (207 F-85 club coupe, 116 Cutlass club coupe, 1,029 Cutlass hardtop); ~12 built on Rallye 350s; factory list: "Induction System - Carburetor Outside Air… 350 Cu. In. 4-Barrel H.C. Engine"

GM Heritage factory kit — 1970 Oldsmobile 442 Info Kit, p.231.
— Confirmed

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This page aggregates every documented appearance of W-31 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.