LAKEWOOD, NJ – GM’s LS-Series engines have earned the reputation for high rpm breathing capability. Unfortunately, the stock cast rocker arms and valvesprings have a tough time keeping up – and when you start increasing the stresses with bigger cams, turbos and superchargers, these shortcomings become big issues.
Jesel’s Sportsman Series LS Shaft Rocker systems for GM LS3, L76 and L92 heads will accommodate increased valve spring pressures (up to 800 pounds open pressure), high-lift cams and increased cylinder pressure from power adders. Best of all, they are a simple bolt-on modification that requires no machine work, just a set of taller valve covers for clearance.
While numerous “trunion-type” upgrades exist, Jesel’s proven shaft rocker technology not only strengthens LS valvetrains, it reduces friction by increasing rocker pivot length to 1.450” and using large .520”- diameter tip rollers – effectively reducing sweep and tip roller rotation at the valve tip. The rockers rotating on precision-sorted roller bearings riding on .561” diameter centerless-ground, hardened tool steel shafts provide further friction reduction.
Jesel builds it’s Sportsman Series LS Shaft Rockers to last. The CNC-machined 2024 aluminum rocker bodies are fully shot-peened for improved strength and stress relief. The rocker shafts are super-tough tool steel, and the 3/8”-24 thread cup adjusters, roller bearings and tip rollers are the same components that Jesel uses in its Pro Shaft Rocker Systems. It is unlikely that they will ever need it, but Jesel’s LS shaft rockers are rebuildable by Jesel’s CPR Rebuilding Service.
LS shaft rocker systems are available in 1.70, 1.75 and 1.80 rocker ratios from authorized dealers or directly from Jesel. For more information please go to Jesel.com or call 732-901-1800.
