2006 Chevy Silverado Performance Upgrades - More Ponies for the Chevy
13. The new rocker arms look just like the stockers with one small exception-the pushrod location is moved closer to the pivot point of the rocker, which mechanically increases the net valve lift from the camshaft. Basically, the rocker arm makes the cam lobes seem taller and opens the valves quicker and further than they would in factory trim, allowing more air to pass through the intake and exhaust ports. The factory cam offers 0.292-inch lift, and when multiplied by the factory 1.7 ratio rockers, opens the valves 0.496.4 inch. The SLP 1.85 rockers increase that lift to 0.5402 inch. This translates into more power, as long as the air inlet system can support it, which in this case, it can.
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