I'll use the E303 cam in the Cobra as an example to explain that. The advertised valve lift is .498 with a 1.6 rocker. The lift on the cam lobe is .311. So with my 1.7 rockers the valve lift is .528. I measured the lift at the cam on mine though and every lobe was .312 making the lift at the valve .530 with my 1.7 rockers.
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