SR20VE tech info
Intake cam:
Primary Lobe 5.35mm lift
Secondary Lobe 6.64mm lift
Primary Valve Lift 8.52mm Lift
Secondary Valve Lift 10.78mm Lift
Base circle clearence 0.2mm
Primary Intake Rocker Ratio = 1.62
Secondary Intake Rocker Ratio = 1.65
Exhaust Cam:
Primary Lobe 4.51mm
Secondary Lobe 6.68mm
Primary Valve Lift 6.69mm
Secondary Valve Lift 10.36mm
Base Circle Clearence = 0.3mm
Primary Rocker ratio = 1.549
Secondary Rocker Ratio = 1.595
SR20DET cam rocker ratio
standard cam is 32 by 38 mm, so 6mm Cam lift and has 9.2mm valve lift.(All from nissan service manual)
giving a rocker arm ratio of 1.53
(advertised lift at valve) = (lift at cam lobe) x (rocker arm ratio)
Part numbers
SR20VE VVL rocker arms – 132571N516, 132571N517 132578H600