No Modification / No Aggravation
Still spending aggravating hours adjusting your traditional style stud rockers only to have to repeat the procedure the 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 on OEM and aftermarket cylinder heads. 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.
Sportsman Series Benefits
Less friction than traditional stud rockers helps create 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.
Sportsman Series Standard Features
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.
Centerless Ground Shafts
Precision ground and heat treated Tool Steel shaft provides years of durable service.
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. SB systems clear up to 1.550” spring and BB systems clear up to 1.625” spring.
Billet Steel Stand
Provides a stable and rigid mounting surface for shaft rocker assembly.
Profiled Rocker Tail
Increases clearance for valve cover while also reducing the rocker’s moment of inertia.
Tool Steel Lash Adjusters
CNC machined, heat treated alloy steel lash adjusters have been proven through years of abuse in our Pro Series Rockers.
Sportsman Series Rockers Are Available For Heads From These Manufacturers
Air Flow Research
All Pro Heads
Sportsman Series Stand Link
This patented stand link, ( U.S. Patent 7,028,653 B2 ) designed for Big Block Chevrolet kits, orientates the CNC machined steel rocker stands and aligns the rocker roller squarely with the valve tip. The stand link also acts as a safety guide in the event of a loose bolt.
Sportsman Series Options
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.