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Valve springs help big time. Seems like they float a little with stock springs at the limiter and the rocker looses the direct pressure/contact and the smacking lets the pin walk out. We had a built motor a year and a half ago shoot out a rocker. Pulled it back out and replaced everything that broke and installed springs/retainers per full blown and it's been good since. Have 3 built motors revving to 8300rpm with ferrea springs and retainers and all have been good since that first one let go
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