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Message: [QUOTE="6.0 Tech, post: 1467718, member: 23001"] Talked with my buddy today at work, heads were machined, but minimal was taken off, .003 was removed when they were machined, heads were original and had never been off, so I don't think there was an issue with valve protrusion, again just a guess, it was not checked. My heads had .005 taken off with no issue about 6 months prior to his being done, and were fine, until they started dumping fuel into the coolant. Valve guides ere not done, but the machine shop did disassemble the heads and completely cleaned them and inspected. Block was not decked or bored. Cam is an rcd stage 1 with rcd 6.4 pushrods now, the elite ones were about a quarter inch longer, as they were for a 6.0. That was the original issue, and were hanging valves open, which is why we also changed all the rockers after the first 2 broke. I figured they were fatigued from being held open and having possible piston contact from being held open. The valve guide issue makes sense though. Is there a way to check for dragging with the heads still on? The other thing that is kind of weird is that it has been a different cylinder each time. After talking with my buddy it was 2 exhaust the first time, then 6 intake, and now 4 exhaust. Thanks for all the help so far. [/QUOTE]

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