Jims Catalogue

ROCKER ARMS

JIMS ® STREET OR STRIP PERFORMANCE QUALITY ROLLER ROCKER ARMS

Special Heat Treat Specifications for Lighter and Stronger Wear.

Rocker Arms are Cast out of Aerospace Quality 4340 Chromoly True 1.625 Ratio

Parabolic Pushrod Cup

Oil Pressure Feed to Roller

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52100 Bearing Grade Steel Rollers

660 Bronze Bushings for Better Oil Control and Shaft Wear

Why Buy a JIMS ® Roller Rocker Arm? • Produced from aerospace quality 4340 chromoly steel • Features a segmented parabolic pushrod cup, which reduces friction at pushrod end and also puts the load on the outer perimeter of pushrod ends • Features full oiling of the roller tip, valve springs and pushrod tip • 52100 bearing steel roller tip for the longest possible life • 660bronze bushing for the best wear resistance and oil control, fit to H-D ® specifications • Reduces friction, heat, and wear in all valve train components from stock to strip • Heat treated by JIMS ® special technique to pro- vide you with the strongest and lightest roller rocker arms • A true 1.625 rocker arm ratio, with improved rocker geometry • Quieter, smoother valve train...The JIMS ® Way!

Here at JIMS ® we’re always researching and developing ways to improve existing product, as in our roller rocker arms. JIMS ® Roller Rocker Arms are made from aerospace quality 4340 steel. This is the “King” of the hardening grade of constructional alloy steels. Due to a richer alloy content, 4340 possesses much deeper concentration of hardening than the 4100 series. This advantage is realized principally where high strength is required in heavy sections. In addition, an unusually high concentration of hardening ensures maximum toughness and ductility at the desired strength level. The fatigue-tensile ratio makes this grade of alloy steel ideal for highly stressed parts. It maintains its strength, ductility, and toughness at relatively high temperatures. It has remarkable non-distorting properties for an alloy steel, with an overall increase in strength and a decrease of flex. We machine the rockers on the newest horizontal CNC mills available. The new rockers are heat treated and assembled with JIMS ® 660 Bronze Bushing, bearing steel roller and axle. The combination of these high quality materials along with our precision machining standards result in the best roller rocker arms available.

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