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Still spending aggravating hours adjusting your stud rockers only to have to repeat the process next weekend? If the answer is yes, then Jesel Sportsman Series rockers are the solution for you. Since their release in 2001, Jesel Sportsman Series rocker systems have proven themselves to be the ultimate replacement for inadequate stud rocker assemblies. Easily able to handle today’s aggressive springs and cam profiles, these 2024 aluminum bodied shaft rockers are designed to withstand open spring pressures up to 900 lbs while maintaining precise valve lash settings. Both racers and engine builders have been rewarded with years of reliable, trouble free service of their Sportsman Series rockers on countless applications from daily drivers to bracket drag cars, various marine applications, oval track dirt and asphalt racing.

Jesel Sportsman Series rocker kits are designed to bolt on without any cylinder head modifications and in most cases still fit under a stock valve cover. The rocker geometry is preset and engineered using the common valve supplied with the particular cylinder head to provide a bolt-on and go installation. Thanks to Jesel’s extensive state-of-the-art CNC machining center and a closely controlled manufacturing process, these specially engineered cost effective rocker systems can be delivered to your door just days after placing your order.


Reduced friction over stud rockers helps to create additional horsepower.

Creates an extremely stable valvetrain at any RPM.

Corrects rocker geometry, diminishes guide wear and maintains lash.

Saves money and time by reducing necessary engine maintenance.
Full Compliment Shaft Needle Bearings
Full compliment needle bearing assembly operates with minimal lubrication while distributing load evenly over shaft surface.

Pressed Pin Nose Roller
Securely retained .520” diameter Tool Steel Nose Roller operates with less friction and decreased valve guide wear.

Profiled Rocker Tail
Increases clearance for valve cover while also reducing the rocker’s moment of inertia.
Billet Steel Stand
Provides a stable and rigid mounting surface for shaft rocker assembly.

Centerless Ground Shafts
Precision ground and heat treated Tool Steel shaft provides years of durable service.

Tool Steel Lash Adjusters
CNC machined, heat treated alloy steel lash adjusters have been proven through years of abuse in our Pro Series Rockers.
Shotpeen Finished CNC Machined Bodies
Machined from custom blended 2024 aluminum designed to resist fatigue from stress and hot operating conditions.

Valve Spring Relief Pocket
Ball mill machined to provide additional clearance between rocker body and valve spring. Small block systems clear up to 1.550” spring. Big block systems clear up to 1.625” spring.
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Cylinder Head 
Type of Racing 
Maximum RPM 
Open Spring Pressure 
Net Valve Lift 
NA / Blower / Nitrous