Premium
Stud Rocker Arms
Leave the girdles and guides behind.
About Jesel Premium Stud Rockers
First released in 1990, Jesel Premium Stud Rockers were developed for NASCAR teams before shaft rockers were legal. 30 years later, we reengineered them for modern classes like NHRA Stock. Today, engine builders can purchase Premium Stud Rockers worthy of the high performance and strength expected from the Jesel name.
Superior Construction and Materials
Jesel Premium Stud Rockers are machined from high-strength 2024 aluminum. The precision ultra-lite CNC bodies are shot-peened to resist fatigue from stress and high operating temperatures. Dual 3/8” wide bearings with external thrust washers rotate on a precision-ground tool steel trunnion, ensuring stability throughout the RPM range. Jesel’s proven 3/8-24 cup style adjuster allows for precise valve lash setting and the stud rockers come standard with needle bearing nose rollers.
Innovative Design and Ease of Use
Unlike traditional stud rockers, Jesel Premium Stud Rockers do not require annoying stud girdles or pushrod guide plates. The rocker pivots on a steel stanchion post which can be shimmed to adjust the rocker arm to valve tip geometry. The steel stanchion post engages into our patented retainer plate to keep the rocker arm perfectly aligned with the valve and is securely fastened to the cylinder head using a 7/16” to 3/8” stepped stud and ARP 12pt nuts.
Available for conventional 24° BB and 23° SB Chevy heads.
Features & Options
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Full complement needle bearing assembly operates with minimal lubrication while distributing load evenly over shaft surface.
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Precision ground and heat-treated Tool Steel shaft provides years of durable service.
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Prolongs the rocker body service life by generating a compressive stress layer, which enhances resistance to fatigue.
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Increases clearance for valve cover while also reducing the rocker’s moment of inertia.
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CNC machined, heat treated H-13 tool steel lash adjusters feature a nitride process for wear protection.
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.250” wide valve tip roller rotates on heavy-duty bearing steel needles to prevent the roller from stalling and skidding on the valve tip.
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Bronze and/or hardened steel thrust washers are used to absorb heavy axial loads and prolong the life of the rocker shaft bearings.
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Rocker kits include either ARP 2000 shaft bolts or ARP 8740 studs and nuts to secure the rockers to the mounting stands.
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Fully rebuildable to Jesel factory specifications through the Jesel CPR department.
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Rockers can be ordered in various ratios to suit your specific engine build. Some applications are ratio limited.
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.