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Rocker arms multiply the valve lift using the rocker ratio. For big-block Chevys, the stock rocker ratio is 1.7:1, which means if the cam offers a lobe lift of 0.330, the theoretical valve lift will be 0.561 inch. These are Crane roller rockers on a big-block.
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 Rocker arms multiply the valve lift using the rocker ratio. For big-block Chevys, the stock rocker ratio is 1.7:1, which means if the cam offers a lobe lift of 0.330, the theoretical valve lift will be 0.561 inch. These are Crane roller rockers on a big-block.  View Related Article

 

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