440 source ductile adjustable rocker arms.

Bewy said

You can buy expensive rockers & still have problems. A number of the adjusters broke on my HS 440 rockers....

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Broke an adjuster, roller lifter kicked out, the other one of the pair went sideways, wrecked a billet solid roller cam. Had the cam reground. Gained duration, lost .100 lift, car slower by 1/2 second.