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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.

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.

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.