Engine profile

1965 Pontiac 421 V8

Pontiac large-journal V8 · 421 cubic inches · Pontiac

1965 2+2 engine bay with 421 Tri-Power induction and aluminum eight-lug context 1965 Pontiac Catalina 2+2 421

Engine Summary

1965 Pontiac 4212+2 4212+2 421 four-barrel421 Tri-Power421 HO376-hp 421

Identification reference

Source-backed component numbers, codes, stampings, and application notes.

Value: 288-degree intake, 302-degree exhaust, 63-degree overlap, 0.409-inch lift
Application: 421 HO only
Type: camshaft / specification
Car pages: 1965 Pontiac Catalina 2+2 421

Value: 338 gross hp at 4,600 rpm; 459 lb-ft at 2,800 rpm; 10.5:1 compression
Application: standard 1965 W51 2+2 with manual or Turbo Hydra-Matic
Type: engine assembly / specification
Car pages: 1965 Pontiac Catalina 2+2 421

Value: 376 gross hp at 5,000 rpm; 461 lb-ft at 3,600 rpm; 10.75:1 compression
Application: optional 1965 2+2
Type: engine assembly / specification
Car pages: 1965 Pontiac Catalina 2+2 421

Value: 356 gross hp at 4,800 rpm; 459 lb-ft at 3,200 rpm; 10.75:1 compression
Application: optional 1965 2+2
Type: engine assembly / specification
Car pages: 1965 Pontiac Catalina 2+2 421

Value: high-output exhaust manifolds, dual straight-through exhaust, low-restriction air cleaners, and declutching fan
Application: 421 HO only
Type: exhaust manifold / specification
Car pages: 1965 Pontiac Catalina 2+2 421

1 linked car page.

Catalina 25237 Sport Coupe or 25267 convertible

W51 2+2 Sports Option

Pontiac Motor Division, General Motors Corporation 1965 Pontiac Full-Line Brochure

Pontiac Motor Division, General Motors Corporation 1965 Pontiac Colors and Interior Information

Pontiac Motor Division, General Motors Corporation 1965 Pontiac 2+2 Print Advertisements

Auto History Preservation Society / Over-Drive Magazine 1965 Pontiac Full Size Cars Fact Sheet