Engine Summary
- Manufacturer
- Pontiac
- Family
- Pontiac V8
- Displacement
- 389 cubic inches
Also Known As
1965 Grand Prix 389Grand Prix 389 four-barrel1965 Grand Prix 389 Tri-Power1965 Grand Prix 4211965 Grand Prix 421 HO
Engine profile
1965 Pontiac Grand Prix 389 V8
Pontiac V8 · 389 cubic inches · Pontiac
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
389 Tri-Power
- Value
- 338 gross hp at 4,800 rpm; 433 lb-ft at 3,600 rpm; 10.75:1 compression
- Application
- optional
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure
421 four-barrel
- Value
- 338 gross hp at 4,600 rpm; 459 lb-ft at 2,800 rpm; 10.5:1 compression
- Application
- optional
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure
421 HO Tri-Power
- Value
- 376 gross hp at 5,000 rpm; 461 lb-ft at 3,600 rpm; 10.75:1 compression
- Application
- optional high-output configuration
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure , 1965 Pontiac Grand Prix
421 Tri-Power
- Value
- 356 gross hp at 4,800 rpm; 459 lb-ft at 3,200 rpm; 10.75:1 compression
- Application
- optional
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure
Regular-fuel 389 two-barrel
- Value
- 256 gross hp at 4,600 rpm; 388 lb-ft at 2,400 rpm; 8.6:1 compression
- Application
- no-extra-cost regular-fuel option with Turbo Hydra-Matic
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure
Standard automatic 389 four-barrel
- Value
- 325 gross hp at 4,800 rpm; 429 lb-ft at 2,800 rpm; 10.5:1 compression
- Application
- standard with Turbo Hydra-Matic
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure
Standard manual 389 four-barrel
- Value
- 333 gross hp at 5,000 rpm; 429 lb-ft at 3,200 rpm; 10.5:1 compression
- Application
- standard with synchromesh transmission
- Type
- engine assembly / specification
- Car pages
- 1965 Pontiac Grand Prix
Sources: 1965 Pontiac Catalina, Star Chief, Bonneville and Grand Prix AMA Specifications , 1965 Pontiac Full-Line Brochure
Cars Using This Engine
1 linked car page.
26657 Sports Coupe (two-door pillarless hardtop)
1965 Pontiac Grand Prix
26657 Sports Coupe