Engine Summary
- Manufacturer
- Pontiac
- Family
- Pontiac V8
- Displacement
- 400 cubic inches
Also Known As
1973 GTO 4001973 Pontiac L78 4001973 GTO 400 four-barrel
Engine profile
1973 Pontiac GTO L78 400 V8
Pontiac V8 · 400 cubic inches · Pontiac
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
L75 455 four-barrel
- Value
- 8.0:1-class compression, 250 SAE net hp and 370 lb-ft
- Application
- optional; Turbo Hydra-Matic only
- Type
- engine assembly / specification
- Car pages
- 1973 Pontiac GTO
Sources: '73 GTO: The Black Goat of the Family , 1973 LeMans Sport Coupe sales brochure , 1973 Pontiac GTO buyer's guide
L78 400 four-barrel
- Value
- 8.0:1 compression, 230 SAE net hp and 325 lb-ft
- Application
- standard with the GTO option; manual or automatic transmission
- Type
- engine assembly / specification
- Car pages
- 1973 Pontiac GTO
Sources: '73 GTO: The Black Goat of the Family , 1973 LeMans Sport Coupe sales brochure , 1973 Pontiac GTO buyer's guide
SD-455 and Ram Air production boundary
- Value
- Advertised and tested but canceled for regular 1973 GTO production
- Application
- do not treat SD hardware or open hood ducts as production-package proof
- Type
- other / specification
- Car pages
- 1973 Pontiac GTO
Sources: '73 GTO: The Black Goat of the Family , 1973 Pontiac GTO buyer's guide
Cars Using This Engine
1 linked car page.
LeMans Coupe or LeMans Sport Coupe two-door Colonnade hardtop
1973 Pontiac GTO
GTO option on LeMans Coupe or LeMans Sport Coupe