"Olds 88 Performance Package" / 390 hp high-compression 455 4-bbl Rocket V-8, dual exhausts, 2.93 axle; M41 (TH-400) mandatory, Y72 HD cooling/alternator required for police use. Genuine RPO-style order code (Delta 88 $199.05; Custom/Royale $77.94), factory-billed as "390-hp Highway Patrol Rocket 455"

Years 1970 Models 2

Also described as 390 hp 455 police engine

Documented applications

Cutlass / 4-4-2

1970 Confirmed

Delta 88 only — listed here for cross-reference; see fullsize-88-98.md

Full-Size 88 / 98

1970 Confirmed

All Delta 88 models w/ automatic

Grade note: confirmed [HK: oldsmobile/1970_Oldsmobile_442_Info_Kit.txt p.9, p.184, p.237]

This page aggregates every documented appearance of W-33 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.