![]() This change on the typical stock cam will increase the lift from. We all know that a change from 1.5 to 1.65 rockers will increase the valve lift by 10%. The following will review the effects of rocker arm changes (and will assume that the rockers measure the stated ratios). Are the higher ratios beneficial? Not necessarily. ![]() We can not verify that all Harland Sharp units measure 1.71, but they probably will always be more than 1.63. By contrast, a set of Harland Sharp roller rockers measure 1.71. A set of Pontiac 1.65 rockers measure 1.62. I have measured several batches, and they are closer to 1.48. However, the Pontiac rockers do not usually measure 1.5. 270, and with a 1.5 ratio, the valve lift becomes a theoretical. A typical Pontiac stock cam has a lobe lift of. A rocker arm ratio of 1.5 means that the actual cam lobe lift will be multiplied by 1.5. ![]() Valve lift is determined by the combination of the cam lobe lift and the rocker arm ratio. We have picked another from his excellent list and will discuss it in this part. Our last column covered several subjects suggested by Fred Cailey from Batavia, Illinois.
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