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Message: [QUOTE="78f100, post: 332772, member: 3542"] Well guys my truck has been doing great since the build but having some trouble maintaining rail pressure. So today I was tuning on the airdog reg and test driving it, I tured the pressure on the airdog down a little and stood in it from about 60mph it held rp of 21k up from 18k, pulled like a freight train and then sounded like a monkey with a hammer under the hood. Boost hit 52psi and egts were good when the knocking started. It had greyish smoke rolling out so I towed it home put the ae on it no codes and all the tests on the ae pass. Ccv tube has quite a bit of pressure coming out, pretty sure cracked piston, what yall think? It didn't puke any coolant. I wonder if they were already weak from when my egts got really high and the hg let go. When I did the studs all the pistons looked good idk, Im gonna do a compression test tomorrow, and gonna try to upload a vid of what it sounds like. [/QUOTE]

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