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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 1224047, member: 8143"] A few months ago ford/navistar had a run of rocker arms that the pedestals were machined wrong. We are hoping that's what it is. Have had another customer have this issue with a set he installed on one of his customers trucks. He thought it was because the heads were decked too far. But in reality when he pulled it apart he measured the pedestal and found they were not right. This was since Erik's engine had already been built. There is a good possibility that this could be the cause. On the engine stand all the valve train and rockers were fine when doing the rollover. None were tight. But as with the others we've heard about, once it starts and pumps a little oil pressure into the lifters, it seems to hold the valves open just a hair. The block is brand new, not decked. The heads were new. They were within spec. The pushrods are the same 9.800" used on every 6.4 made. The lifters, well I have no idea as I have never used the ones Erik supplied for the build. We are talking small amounts, a long ways from coil bind. It would have to be a half inch off the even come close.... It sucks, but on the engine stand there is nothing we could have done different. If it was the incorrect rocker pedestal machining that caused it, we didn't know there was even a problem to check for. This has just surfaced in the last month or so. It coincides with ford being back ordered on rocker assemblies for month earlier this year. Either way, it sucks, but not the end of the world. I've been helping Browns with the trouble shooting and they are headed in the right direction. This is certainly not the first 6.4 or 6.0 that has had an issue like this that I've heard of. Between milled heads, blocks, 6.0 pushrods used in 6.4's etc.... I've had a lot of people tell me stories like this. That's why we have shorter pushrods for these occasions. Sent from my iPhone using Tapatalk [/QUOTE]