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At zero lash (zero lifter preload) the measurement of the adjustable pushrod turned out to be 8.021-inch in length. LS engines like between 0.070 to 0.090-inch lifter preload. So, by adding 0.079-inch length to our measurement, the needed pushrod would be 8.100-inch long for proper lifter preload using the stock net-lash rocker arm system. Pushrods are available only in 0.050-inch increment lengths. Different cam manufacturers have different base circles which can affect pushrod length. Always be careful to check pushrod length when swapping a cam.