Nitro / Alcohol Series


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Ultra Strong / Direct Replacement


Proven through hundreds of wins and numerous championships, Jesel’s Pro Steel Top Fuel rockers have helped multiple drivers make it reliably to the final round. Manufactured from an annealed 4340 forging, these heat treated steel bodies have been designed using the latest FEA software to withstand deflection up to 10,000psi. Polish finished and coated to resist corrosion inherent with Nitro Methane, these rockers feature a precision honed Ampco 45 bushing which when mated to our DLC coated shaft results in an extremely low coefficient of friction. The rockers come standard with a .550” diameter tool steel nose roller and are machined to accept a 7/16-20 adjuster. The intake rockers are machined with an internal oil passage for direct shaft oiling. As with all Jesel rockers, various ratios are available as well as custom engineering services.

Series Benefits

  • Machined from Annealed 4340 Forgings

  • Precision honed bronze bushings

  • Accepts 7/16-20 lash adjusters

  • Multiple ratio choices

  • Fully re-buildable


  • AJPE / Top Fuel Head

  • BAE / Top Fuel Head

  • BAE / Alcohol Head

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Top Fuel Shafts

These direct replacement Top Fuel Shafts are manufactured from through hardened H-13 tool steel with a stout .280” wall thickness. They are then processed with REM/ISF® Superfinish and DLC coated for improved wear and reduced friction.

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Top Fuel Adjusters

Jesel offers a 7/16-20 lash adjuster for use with the Nitro / Alcohol series rockers. These tool steel adjusters are through hardened and feature a .375” diameter nitrided ball end. The intake rocker adjuster features an internal oil circuit to direct oil to the pushrod cup. Exhaust rocker adjusters are available with or without through hole oiling.  


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.

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