Manton Rockerarm

1.8 Intake Roller Rocker Arm - Fat Head Hemi

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We have taken an aggressive approach in the design of our Top Alcohol and ProMod intake rockerarms. It has been designed to be an upgrade replacement for the intake rockerarm being used today in the Top Alcohol, “A” Fuel and Pro Mod categories. Changes have been made in several areas to improve the performance of the valve train. This will help correct some physical geometry issues that have come about through cylinder head changes over many years. Changes in valve lift, increased spring pressure, installed spring height and changes in the location of the intake rockerarm shaft have made it necessary to correct the valve side fulcrum length of the rocker body. This change locates the roller bearing closer to the center of the valve which decreases the possibility of the bearing running off the edge of the contact patch. The fulcrum length, on the pushrod side of the rockerarm, is also increased to correct the rockerarm ratio. These corrections provide additional pushrod clearance and applications where a 7/16” diameter pushrod is being used it becomes possible to increase the pushrod diameter to 1/2”. This improves the stability of the valve train at engine speeds above 8,500 RPM and as high as 11,000 RPM+. The roller wheel has been increased in size to a very large .5710” diameter and the pin to .2756”, but not increased in width. The increased pin diameter is necessary to maximize the strength of the roller which has become increasingly important as cylinder pressures continue to increase. Also includes the 3/8 ball adjusting screw.


Cnc Machined From 4340 Steel

Made in America!

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

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