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Castech Casting Number 706


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Forgive me for posting as I'm sure this has been covered, but I couldn't find it. I have an '04 Silverado with 150,000 miles on it and I'm starting to get antifreeze out of the exhaust pipe when I first start up. I know the Castech cylinder heads are porous and the cause of the problem. What I haven't found is a solution. Is there a cylinder head casting number to look for that denotes a good head? Is GM helping with any warranty at all? Am I stuck with an engine that is going to continue to get worse?

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