These kits install the adjusters into the lifter bodies in a manner which increases the stability of the pushrods at greater angles. The standard kit includes 1/2"-diameter 6061-T6 aluminum push rods, while the deluxe kit features pushrods made of 7/16"-diameter 4130 seamless chrome moly tubing. The pushrods are long enough for engines with stroker cylinders, and all wear surfaces are hardened for durability.
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Harley-Davidson Big Twin 66-E84