Pro Aluminum Series
SHAFT ROCKERS
Custom Built to Your Specifications
Championship winning racers in virtually every form of racing from NHRA Pro Stock to Sprint Cup rely on Jesel Pro Series shaft rockers to get them into the winners circle. Used by top engine builders worldwide, Jesel rockers continue to set the standard by which all others are measured.
The excellent mechanical properties inherent to our custom blended 7000 Series aluminum alloy allows for the design of an extremely durable and lightweight valvetrain assembly. Tensile strength of our custom blended alloy at 300° far exceeds that of the less expensive, industry standard 2024 alloys. Low moment of inertia along with FEA designed bodies ensures that lobe lift is not wasted due to rocker body deflection.
The Pro Series rocker systems are built and custom manufactured to your specifications. Anything from rocker ratio to adjuster offset to lightening options can be tailored to your specific needs. A shotpeened surface finish along with a profiled rocker tail and a clipped-pin nose roller are standard features found on the Pro Series kits. Even the rocker stands can be custom ordered if needed to compensate for longer than stock valve lengths.
Available Rocker Bodies
A. Solid Body
1.650 Pivot BB Rocker / Weight: 210g
Our strongest rocker body. Intended for use with high cylinder pressure applications such as nitrous and blowers.
B. Mohawk Beam
1.650 Pivot BB Rocker / Weight: 195g
Our stiffest lightweight body. Lowest moment of inertia ideal for extremely high RPM valve control and extended spring life.
C. Standard Slot
1.650 Pivot BB Rocker / Weight: 202g
Our default lightening program. Provides for a stiff body capable of controlling the valvetrain at high RPM.
Jesel Pro Aluminum Series Features & Options
Standard Shot Peen Finish
Induces an even, compressive stress layer in the surface of the rocker body. Increases the resistance to fatigue failures. Adds compression strength and stress relieves rocker body.
Optional Ball Adjuster
Has less friction than cup type adjusters. Makes rocker arm stronger by increasing the adjuster thread area and eliminates counterbore area.
Optional ARP Shaft Bolts
Manufactured from ARP 2000 material, these bolts can be torqued to 35 ft lbs and are recommended for spring pressures exceeding 800lbs. open.
Optional Needle Roller
Recommended for use with high lift, high spring pressure applications. Prevents the roller from stalling and skidding across the valve tip. Highly recommended when using .312” or smaller valve stems.
Tool Steel Ball & Cup Adjusters
All of Jesel’s lash adjusters are machined in house using high grade H-13 Tool Steel. They are then heat treated and finally put through a nitriding process to apply a hardened case on the parts for wear protection.
Optional Needle Rollers
Recommended for use with high lift, high spring pressure applications. Prevents the roller from stalling and skidding across the valve tip. Highly recommended when using .312” or smaller valve stems.
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.
