Engine Summary
- Manufacturer
- Pontiac
- Family
- Pontiac large-journal Super Duty V8
- Displacement
- 421 cubic inches
Also Known As
1963 Pontiac 421 Super Duty1963 SD-4211963 Pontiac 390-hp 4211963 Pontiac 405-hp 4211963 Pontiac 410-hp 421
Engine profile
1963 Pontiac Super Duty 421 V8
Pontiac large-journal Super Duty V8 · 421 cubic inches · Pontiac
Identification reference
Engine Details
Source-backed component numbers, codes, stampings, and application notes.
Dual-Carter induction
- Value
- Carter AFB 3433S front and 3435S rear
- Application
- 405- and 410-hp Super Duty 421
- Type
- carburetor / part number
- Car pages
- 1963 Pontiac Catalina Super Duty 421
Sources: 1963 Pontiac Full Size Cars Fact Sheet , Swiss Cheese Super Duty - a factory lightweight Pontiac Catalina heads to auction
Single-Carter induction
- Value
- Carter AFB 3475S
- Application
- 390-hp Super Duty 421
- Type
- carburetor / part number
- Car pages
- 1963 Pontiac Catalina Super Duty 421
390-hp configuration
- Value
- 11.0:1 compression; 390 hp at 5,800 rpm; 435 lb-ft at 4,400 rpm
- Application
- Single-four-barrel Super Duty 421
- Type
- engine assembly / specification
- Car pages
- 1963 Pontiac Catalina Super Duty 421
405-hp configuration
- Value
- 11.0:1 compression; 405 hp at 5,600 rpm; 425 lb-ft at 4,400 rpm
- Application
- Dual-four-barrel Super Duty 421
- Type
- engine assembly / specification
- Car pages
- 1963 Pontiac Catalina Super Duty 421
410-hp configuration
- Value
- 12.0:1 factory-listed compression; 410 hp at 5,800 rpm; 430 lb-ft at 4,600 rpm
- Application
- High-compression dual-four-barrel Super Duty 421
- Type
- engine assembly / specification
- Car pages
- 1963 Pontiac Catalina Super Duty 421
Bore and stroke
- Value
- 4.09375 x 4.00 inches
- Application
- All 1963 Super Duty 421 configurations
- Type
- engine assembly / specification
- Car pages
- 1963 Pontiac Catalina Super Duty 421
Sources: 1963 Pontiac Full Size Cars Fact Sheet , Super Duty Substitution - 1963 Pontiac Catalina
Lightweight competition revision
- Value
- Retrospective sources report Mickey Thompson forged pistons near 13.0:1, modified heads, light valves, and aluminum exhaust manifolds
- Application
- Documented Swiss Cheese lightweight cars; exact equipment is car-specific
- Type
- engine assembly / specification
- Car pages
- 1963 Pontiac Catalina Super Duty 421
Sources: 1963 Pontiac Catalina Super Duty Swiss Cheese , Swiss Cheese Super Duty - a factory lightweight Pontiac Catalina heads to auction
Mechanical valve train
- Value
- McKellar No. 10 flat-tappet camshaft, 308/320-degree duration, and 1.65:1 rocker arms
- Application
- 1963 Super Duty 421
- Type
- valve train / specification
- Car pages
- 1963 Pontiac Catalina Super Duty 421
Sources: 1963 Pontiac Full Size Cars Fact Sheet , Swiss Cheese Super Duty - a factory lightweight Pontiac Catalina heads to auction
Cars Using This Engine
1 linked car page.
Series 23 two-door sedan (2311)
1963 Pontiac Catalina Super Duty 421
Factory special-order competition program through early 1963