Reference Details
- Common issue
- L75 455, later 455, SD-455, or generic swapped Pontiac 455 represented as the 1971 LS5 Formula 455 HO · 1971 Pontiac Firebird Formula 455 HO
- Confidence
- documented · 1971 Pontiac Firebird Formula 455 HO
- Correct value
- 455 CID LS5 HO V8 with source-consistent engine code, carburetor, round-port hardware, dates, castings, and paperwork · 1971 Pontiac Firebird Formula 455 HO
- Where to check
- Engine code pad, block/head/intake/carburetor casting and date evidence, Ram Air hardware if claimed, service records, and factory billing · 1971 Pontiac Firebird Formula 455 HO
- Common issue
- L75 455, later 455, SD-455, or generic swapped Pontiac 455 represented as the 1971 LS5 Trans Am 455 HO · 1971 Pontiac Firebird Trans Am 455 HO
- Confidence
- documented · 1971 Pontiac Firebird Trans Am 455 HO
- Correct value
- 455 CID LS5 HO V8 with source-consistent engine code, carburetor, round-port hardware, dates, castings, Ram Air path, and paperwork · 1971 Pontiac Firebird Trans Am 455 HO
- Where to check
- Engine code pad, block/head/intake/carburetor casting and date evidence, shaker and air-cleaner hardware, service records, and factory billing · 1971 Pontiac Firebird Trans Am 455 HO
- Common issue
- Standard 400/455, later 455, SD-455, or generic swapped Pontiac 455 represented as the 1972 LS5 Formula 455 HO · 1972 Pontiac Firebird Formula 455 HO
- Confidence
- documented · 1972 Pontiac Firebird Formula 455 HO
- Correct value
- 455 CID LS5 H.O. V8 with source-consistent engine code, 7042273 or 7042270 carburetor path, round-port hardware, dates, castings, and paperwork · 1972 Pontiac Firebird Formula 455 HO
- Where to check
- Engine code pad, block/head/intake/carburetor casting and date evidence, service records, and factory billing · 1972 Pontiac Firebird Formula 455 HO
