Broken rocker arms two weekends in a row

pittsburghracer said
And this is on a crazy fast engine with probably .900 lift or so.

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pink340swinger said
I had something similar happen to me last weekend. .982 lift and 9800rpm. Only the second time I've broken a rocker arm.

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We're your rockers cryo treated? Im thinking about having some parts cryo treated and am just curious.