To fit early engines with 47 mm bearings.
Grind like RSR usuable for camhousings with 3 or 4 bearings.
Exhaust valve lift 11,7 mm duration 328°.
Intake value lift 12,2 mm duration 336 °.
Valve lift at TDC
Inlet: 5,95 mm
Exhaust 4,85 mm
Lobecenter 100 °
With inside oil feed.