1999 Pontiac Trans Am SLP Dyno Testing - Trans Slam
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On the left is the SLP 1.85-ratio rocker that adds 10 percent to the max valve lift (lift increases to 0.544-inch). The SLP rocker also speeds up the valve action (i.e., opens and closes the valve faster), which increases the air velocity through the motor while adding power and throttle response. SLP's springs are manufactured by Manley and have increased pressure, 110 pounds at 1.80 inches installed height closed, 350 pounds at 1.22 open. When new, the stock spring (far right) was rated 76 pounds at 1.80 inches closed and 220 pounds at 1.32 open. (It would be a good idea to move up to a fresh set of springs on an '01-'02 LS1 as well to have better springs with less chance of valve float at the high rpm.) View Related Article
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