Hurst/Olds 455 engine codes: W-45 = non-A/C (D heads, W-31 carb 7028255, 3.91 axle), W-46 = A/C (C heads, carb 7028251, 3.08 axle)

Years 1968 Models 1

Documented applications

1968 (W-46 referenced again in 1969 assembly manual) Confirmed

1968 H/O: 515 built, Peruvian Silver/black, 390 hp 455, OW TH-400; 1969 H/O: 912–914 built, Cameo White/Firefrost Gold, 380 hp, OH-code TH-400, mailbox hood scoops — H/O is a Demmer/Hurst conversion, not an Olds RPO package

This page aggregates every documented appearance of W-45 / W-46 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.