Manton Rockerarm

1.7 Exhaust Roller Rocker Arm - Fat Head Hemi

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The standard features of the Manton “I-Beam Rockerarm” were incorporated into the design with the prime intention of increasing the strength, stiffness, stability and reliability required in the Top Alcohol and Pro Mod categories. The I-Beam rocker design is not a new idea, in fact it is far from it. No one can claim to have the Original I-Beam Rockerarm. If we look back in history we will realize that the original Chrysler early HEMI rockerarm was an I-Beam. Many other rockerarms designed as far back as 1918 were I-Beams. With that said, it is the preferred design theory when it comes to structural strength and stiffness. That is true whether we are designing a building or a rockerarm.  Top Fuel engine assemblies produce cylinder pressures approaching 24,000 PSI. A-Fuel engines are in the range of 13,000 PSI.  In this case the exhaust rockerarm must be as strong as possible and at the same time stiff enough to maintain valve train control. The Manton Roller Tip, I-Beam Rockerarm provides the highest strength to weight ratio of any design configuration. We use 4340 steel billet to manufacture all of our billet rockerarms and each rocker body is heat treated to 305,000 P.S.I. This is not a forged rockerarm, it is a true billet rockerarm providing perfect grain alignment, which improves reliability and consistency. An oil passage supplies engine oil pressure to the adjusting screw which minimizes the possibility of pushrod galling. This also limits unwanted and unnecessary oil spillage and oil pressure loss. The roller wheel has been increased in size to a very large .5710” diameter and the pin to .2756”. The increased pin diameter is necessary to maximize the strength of the roller which has become increasingly important as cylinder pressures continue to increase.


Incorporates the same adjusting screw we supply to Top Fuel Teams.


If you have any additional questions please feel free to Email or Call us!

Made in America!

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