LAKEWOOD, NJ – Chrysler has kept its tradition of Hemi valvetrain domination alive with its new 5.7 and 6.1L shaft rocker systems. Chrysler’s new-age Hemi is finding its way into high performance and racing applications, and the stock valvetrain is totally inadequate for high-lift cams and high valvespring pressures. JESEL shaft rockers, P/N KPS-300153, are a must if you want to change ratio, install larger valve springs or longer valves because the O.E. rocker system is not adjustable.The new 1.500 pivot rocker bodies are CNC-machined out of tough, shotpeened 7000 series alloy aluminum and fitted with Timken needle bearings that ride on centerless-ground steel rocker shafts. These rockers will easily clear 1.450” diameter springs and are rated for spring pressures exceeding 600-pounds-open. Other standard features include a one piece aluminum base plate, steel-billet stands available in .025” height increments, all necessary mounting hardware and tool steel lash adjusters.
To reduce friction and valve guide wear, standard .250” wide needle nose rollers are installed to prevent roller “skidding” in high pressure situations. JESEL’s exclusive Ball Adjusters can be added that also reduce friction and result in a slightly stronger rocker body. (Special pushrods with cup ends are required).
Rocker ratios are available from 1.60-1.70. Cylinder head machining is necessary to install this shaft rocker system as well as the elimination of the MDS (multi displacement system). The block must be converted to roller lifters with conventional pushrod type oiling. For more information please contact: JESEL Valvetrain Innovation, 1985 Cedarbridge Ave., Lakewood, NJ 08701. Phone 732.901.1800, Fax 732.901.6777, or visit www.jesel.com.