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Possible Castech Head Leak


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I have started noticing coolant disappearing. if I happen to discover I have castech heads on my 2006, where is the best way to buy good GM OEM bolt-on heads that are non-castech? I would prefer ones from another 5.3L engine but I don't know how to make sure they re the correct compression and valve sizes, etc.

 

I do not know how to match them up, casting numbers, nor compressions, etc.

 

Any suggestions appreciated.

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