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I recently rebuilt the original 428CJ in my 69 without going crazy. Stuck in a mild Comp Cam's Hyd flat tappet with duration at 268/268 and lift at .494/.494. runs like a bat out of hell but after it gets warm I'm starting to get lifter clatter. Did a proper break-in with the purple heavy zink stuff as well. Any ideas?

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Adjustable rocker arms or no? I like to use the adjustable type, slightly more rocker ratio as well. But what did you use?
 
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