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never heard of that,thats a new one..........check the witness pattern/imprints on the contact points and clearances,wonder if he ran it loose,or if the wingnut who built the engine didn't use shorter guides and ran a big cam and compressed the whole assembly busting the arm??????sounds funny,how does the inside of the exposed material look like? Is it poreous(full of casting holes)? Maybe a bad casting?...they are fordged steel so I'm currious to know what the inside of the rocker material looks like...strange...