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Datsun 620 (1972–1979) Technical Specs
Engine and Performance
- L-Series Powertrains: The North American models evolved through three main SOHC iterations: the 1.6L L16 (96 hp), the 1.8L L18 (100 hp), and finally the 2.0L L20B (110 hp), all known for their extreme durability and interchangeability with Datsun 510 performance parts.
- Fuel Systems: Primarily utilized a single downdraft carburetor (based on the Weber 32/36 design), though the L-series head is a favorite for dual Sidedraft DCOE or SU-style upgrades.
- NAPS (Nissan Anti-Pollution System): Introduced in 1975, this allowed the 620 to meet California's stringent emissions standards using an EGR-based system without requiring a power-robbing catalytic converter initially.
Drivetrain and Transmission
- Transmission Options: Standard equipment was a 4-speed manual, but a 3-speed automatic became available in mid-1972. In 1977, a 5-speed manual (FS5W71B) became a high-take-rate option, significantly improving highway driveability.
- Rear-Wheel Drive: Exclusively factory-produced as a RWD vehicle, though many period-correct 4x4 conversions were performed by dealerships using Dana axles and transfer cases.
Chassis and Design
- Suspension Architecture: Features independent front suspension with torsion bars that allow for nearly instant ride-height adjustments via a simple jam nut. The rear uses longitudinal semi-elliptic leaf springs with telescopic shocks.
- Braking Evolution: Early models (1972-1977) used 4-wheel hydraulic power-assist drums; the 1978 facelift brought standard front disc brakes, a major technical safety milestone for mini-trucks.
- Body Styles: Available in standard bed, 7-foot Long Bed (1975), and the innovative King Cab (1977), which added nearly a foot of interior cabin space for storage and taller drivers.
Dimensions
- Wheelbase: 101.1 inches (2,568 mm).
- Overall Length: 169.2 inches (4,298 mm).
- Curb Weight: Approximately 2,286 lbs (1,037 kg).
