Pro Series LS
Jesel is well known for its innovation in shaft rocker systems where valvetrain geometry can be optimized. However, the new FactoryStock GM COPO engines require that the stock valvetrain geometry be retained with any rocker upgrade, and frankly, these new LS-style head sleeve little room for a proper shaft rocker system.
So, we’ve reinvented the pedestal rocker for these ultra performance LS7 heads.
Jesel LS7 Pedestal Rockers are machined from 4340 billet steel, fully heat treated, REM finished and rotate on heat-treated, tool steel trunnions on dual .312” needle bearings. They feature .250” wide x .520” diameter needle bearing nose rollers and threaded ball-style lash adjusters.
These jewelry-like LS7 Pedestal Rocker Systems are designed for stock length valves and 1.80 or 1.90 ratios, but can handle higher spring pressures and increased valve lifts over stock rockers.
- Machined from 4340 billet steel, heat treated and REM finished
- Designed for use with stock length valves
- Can handle higher spring pressures and increased valve lift over stock
- Available in 1.80 or 1.90 ratios
- .250” wide x .520” diameter needle bearing nose roller
- Threaded ball style lash adjuster
- Heat treated tool steel trunnion rotates on dual .312” needle bearings
- ARP mounting hardware
Our Rocker Story
When Chevrolet introduced its small-block V8 in 1955 one of its highly praised features was its lightweight stamped steel rocker system. With little more than a factory Duntov solid lifter cam a 7,000rpm redline was realistic. This economic valvetrain had its limits though. As long as mild seat pressures of around 100 pounds were used with low-lift hydraulic or flat tappet cams, life was good. As aftermarket cam manufacturers started grinding higher lifts, the rocker’s shortcomings began showing up. First, the rockers bottomed-out on the rocker studs because the slots were too short, then as spring pressures increased the studs pulled or broke out of the head bosses. The fixes came both from the aftermarket and GM.