The D-cam was original for the B20E up to 1973 and B20F.
Recomended tightening torque camshaft nut, 8 Kgm. (58 Lb.ft.)
Use a folding washer or Loctite to lock the camshaft nut.
Usually Used With B20 E/F Fuel Injection engines.
Works great with Dual Su or Strombergs.
Usually used with Twin Carbs.

Camspec.
Lobeseparation: 110,75°
Duration SAE.
Intake: 279°. Exhaust: 275°.
Duration .050".
Intake: 224°. Exhaust: 223°.
Valvelift.
Intake: 10,94 mm. Exhaust: 10,87 mm.
Valve lash.
Intake: 0,43 mm. Exhaust: 0,43 mm.