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How can I determine valve lift if I change rocker arm ratio?
Using the advertised valve lift of your cam, divide that figure by the current rocker ratio. This figure is your theoretical lobe lift. Multiply that figure by the new rocker ratio and the result is your new valve lift.
Using the advertised valve lift of your cam, divide that figure by the current rocker ratio. This figure is your theoretical lobe lift. Multiply that figure by the new rocker ratio and the result is your new valve lift. 
