4G15 MIVEC Rocker Ratio - Stage 1 Cams VS OEM

ROCKER ARMS AND CAMSHAFTS
Cam height mm
             Standard  Limit
Intake valves    35.08   34.58
Exhaust valves  34.26   33.76





Cylinder head overall height 131.9 − 132.1 (Standard value)

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Best way I could measure lift












Removing MIVEC so that I can install new cam seal

Little bit of assembly lube.












Pumping the lifters with diesel







































OEM Exhaust Cam see ~6.687mm of valve lift, which correlates to approx. 62.8CFM from the measured intake lift of 6.985mm

STG1 Exhaust Cam see ~8.1385mm of valve lift, which correlates to approx.71.2CFM from the measured intake lift of 8.255mm
Which works out to be 11.80% of increase from a ported head and stg1 cams



OEM Intake Cam see ~8.284mm of valve lift, which correlates to approx.95.3CFM from the measured intake lift of 8.255mm

STG1 Intake Cam see ~9.2555mm of valve lift, which correlates to approx.102.35CFM from the measured intake lift of 9.525mm
Which works out to be 6.89% of increase from a ported head and stg1 cams