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Message: [QUOTE="Dzchey21, post: 1032532, member: 63"] Whats the point of replacing them? They usually crack from the exhaust valve to the glow plug hole, or from exhaust valve to exhaust valve, if they are really bad they will crack to an intake valve. They rarely go any further than that so whats the risk? Sure you might loose like 2psi of compression, big deal. Most people dont even know thier heads are cracked untill they pull the heads and find them. Do they gain any power by putting a set of new heads on? No. These heads have an induction hardened valve seat, meaning its part of the head, its not going to drop the seat out or anything like that so the risk is low. Hell i have even PUT hardened seats in an already cracked head with no issues, once the crack makes it to the glow plug hole or wherever they stop. Ever heard of a crack going so far it pressurizes the cooling system on a 6.4? Me either [/QUOTE]

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