Engine Summary
- Manufacturer
- Pontiac
- Family
- Pontiac V8
- Displacement
- 389 cubic inches
Also Known As
1966 Grand Prix 3891966 Grand Prix 389 four-barrel1966 Grand Prix 389 4-bbl1966 Grand Prix regular-fuel 389
Engine profile
1966 Pontiac Grand Prix 389 V8
Pontiac V8 · 389 cubic inches · Pontiac
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
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
- 1966 Pontiac Grand Prix
Sources: 1966 Pontiac Full-Line Brochure , 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
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
- 1966 Pontiac Grand Prix
Sources: 1966 Pontiac Full-Line Brochure , 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
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
- 1966 Pontiac Grand Prix
Sources: 1966 Pontiac Full-Line Brochure , 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
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 option with Turbo Hydra-Matic
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Grand Prix
Sources: 1966 Pontiac Full Size Cars Fact Sheet , 1966 Pontiac Full-Size AMA Specifications
Standard automatic 389 four-barrel
- Value
- 325 gross hp at 4,800 rpm; 429 lb-ft at 2,800 rpm; 10.5:1 compression; Carter AFB 4034S
- Application
- standard with Turbo Hydra-Matic
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Grand Prix
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
Standard manual 389 four-barrel
- Value
- 333 gross hp at 5,000 rpm; 429 lb-ft at 3,200 rpm; 10.5:1 compression; Carter AFB 4033S
- Application
- standard with synchromesh transmission
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Grand Prix
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
Cars Using This Engine
1 linked car page.
26657 two-door pillarless hardtop coupe
1966 Pontiac Grand Prix
26657 two-door hardtop coupe