Engine Summary
- Manufacturer
- Pontiac
- Family
- Pontiac large-journal V8
- Displacement
- 421 cubic inches
Also Known As
1966 Pontiac 4211966 2+2 4211966 2+2 421 four-barrel1966 421 four-barrel1966 421 Tri-Power1966 421 HO1966 376-hp 421
Engine profile
1966 Pontiac 421 V8
Pontiac large-journal V8 · 421 cubic inches · Pontiac
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
421 HO valve timing
- Value
- 288-degree intake, 302-degree exhaust, 63-degree overlap, 0.409-inch lift
- Application
- 421 HO only
- Type
- camshaft / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Regular Brochure
Rochester Tri-Power carburetors
- Value
- manual 7025078 front, 7026075 center, 7025079 rear; automatic 7024078 front, 7026074 center, 7024079 rear
- Application
- 356-hp and 376-hp Tri-Power
- Type
- carburetor / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
Standard Carter AFB
- Value
- 4033S with synchromesh; 4037S with Turbo Hydra-Matic
- Application
- 421 four-barrel
- Type
- carburetor / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Models Described in Detail
421 four-barrel
- Value
- 338 gross hp at 4,600 rpm; 459 lb-ft at 2,800 rpm; 10.5:1 compression
- Application
- standard 1966 2+2
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Regular 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 1966 2+2
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Regular Brochure
421 Tri-Power
- Value
- 356 gross hp at 4,800 rpm; 459 lb-ft at 3,200 rpm; 10.75:1 compression
- Application
- optional 1966 2+2
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Sources: 1966 Pontiac Full-Size AMA Specifications , 1966 Pontiac Regular Brochure
Bore and stroke
- Value
- 4.09375 x 4.00 inches
- Application
- all 421 configurations
- Type
- engine assembly / specification
- Car pages
- 1966 Pontiac Catalina 2+2 421
Cars Using This Engine
1 linked car page.
Series 25437 hardtop coupe or 25467 convertible
1966 Pontiac Catalina 2+2 421
254 2+2