• From 1968 to 1970, the two-seat Datsun 2000 roadster joined the similar (but smaller-engined) 1600 in the company's lineup. Displacing 1,982 cc (121 cubic inches), its in-line, overhead-cam, four-cylinder engine produced an impressive 135 hp using two Hitachi SU-type carburetors and a 9.5-to-1 compression ratio. With optional Solex carbs it made up to 150 hp. In a car with a 2,150-lb. curb weight, either option provided enough power for a robust drive.
  
  

Spark Plugs and Compression, Recommendations

• The engine type code for the 1968 Datsun 2000 was U20. It featured five main bearings, a cast-iron block and an aluminum head. NGK type B-6E spark plugs were standard equipment; the spark plug's recommended gap should be .027 to .031 inch. The recommended tightness for the plugs was 11 to 15 foot-pounds of torque. Cylinder compression was 150 to 175 psi.
  
  

Ignition and Timing Recommendations

• The cylinder firing order was 1-3-4-2. The distributor point gap was .019 to .021 inch. Cam angle was 49 to 55 degrees. Ignition timing was set to top dead center (TDC), with the engine warmed up. The correct idle speed, with the engine at operating temperature, was 700 rpm.
  
  

Valvetrain

• Intake and exhaust valves arrangement was as follows (where "E" represents exhaust and "I" represents intake): E-I-I-E-E-I-I-E. Intake valves had a tappet clearance of .008 inch, while exhaust valves had a .012-inch clearance.