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Message: [QUOTE="Zeb, post: 1521676, member: 30304"] The only time I’ve seen a rocker break on a 6.0 is from piston to valve contact. I’m not saying it couldn’t be the valve guide, but incorrect piston protrusion, or incorrect valve recession, or over reving one, is a lot more likely. I ran a Straub cam in my Excursion and it had a big lsa and a lot of duration. I hated it, and when I took it out I had valve marks on a couple pistons and several cracked rocker arms. Put it back together with an RCD Stage 1 cam, and 1 head had valves that were .005” under the specified minimum factory spec for valve recession. 14,000 miles later it broke 3 rocker arms on that head. 3rd time around now. Colt Stage 2 cam, Motorcraft lifters, 6.4 length pushrods, correct valve recession, and all new 6.4 rocker arms. Also had a Straub cam in a 6.0 that sled pulls regularly. That thing would break rocker arms on a regular basis. Pulled it apart to swap in a Colt cam, and it had valve marks on multiple pistons. I don’t want to be all doom and gloom, but in my experience, if you’re breaking rocker arms on a 6.0, you’ve got underlying issues. [/QUOTE]

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