PRI 2011: Jesel’s New Shaft Rockers Take 5.7/6.1L HEMI To Next Level

This shaft rocker system enables guys to run a larger diameter spring, which will really take them to the next level in performance from the stock valvetrain.

Like the GM LS market, we’ve seen quite a bit of attention turned to the late model HEMI vehicles here at PRI this year from the performance aftermarket, and among those showcasing new components for said powerplants is the innovative team at Jesel Valvetrain.

In keeping alive its tradition of renowned product offerings for the big block HEMI,, Jesel has launched a new shaft rocker system for the 5.7L and 6.1L HEMI engines found in the late model Dodge Challenger, Charger, Magnum, and Chrysler 300C, delivering performance and durability for racers and engine builders with a whole new level of potential.

As engine builders have pushed the limits of these new-age HEMI’s, the stock valvetrain has proven largely inadequate for high lift camshafts and high valve spring pressures. These new shaft rockers from Jesel are simply a must if one wishes to change ratio, install larger valve springs, or longer valves, because the OEM rocker system is non-adjustable.

“This shaft rocker system enables guys to run a larger diameter spring, which will really take them to the next level in performance from the stock valvetrain,” explains Jesel’s Bob McDonald.

This new shaft rocker package from Jesel allows for a number of different ratios (offered by Jesel), along with the adjustability to longer/larger valves and larger valve springs.

This new rocker kit sports a 1.600 pivot rocker body that’s been CNC machined out of shot-peen finished 7000 series alloy aluminum and fitted with needle bearings that ride on the center-less ground steel rocker shafts. These rockers easily clear the 1.450-inch diameter springs and carry a rating of 600-pounds-open on the spring pressure. A one-piece aluminum base plate, billet steel stands in .025-inch increments, valve cover spacers, mounting hardware, and lash adjuster tool are all among the features of this new package from the folks at Jesel.

Jesel offers a number of different ratio choices for this rocker system, and machining of the cylinder head is necessary for its installation, along with the elimination of the MDS (multi displacement system). The block also has to be converted to solid roller lifters with conventional pushrod type oiling. Jesel recommends that customers send their cylinder heads to their facility for proper machine work for this shaft rocker system.

About the author

Andrew Wolf

Andrew has been involved in motorsports from a very young age. Over the years, he has photographed several major auto racing events, sports, news journalism, portraiture, and everything in between. After working with the Power Automedia staff for some time on a freelance basis, Andrew joined the team in 2010.
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