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Wow, finally some good news...geez! Here is a couple more shots...there's diamonds in that there valley boys! Date code on block.

So you're thinking this engine is the optimizer?

Normal run temp is 195 but I was loosing coolant and getting strange temp swings which is why we found this. Never overheated under my driving but can't speak to previous owner. I started this journey by finding the nasty coolant.

Hey green, yes, I've tried to keep the title and posts as similar as I can so we can cross reference, this was a terrific suggestion, thanks again. This may well show my ignorance here but am I the only one who is seeing that they may have used the wrong gasket in the last install? Look...

Obviously, we are replacing the heads but gonna need some suggestions on the "while you're there" parts. Dynamic balancer? Water pump? Injectors? Gonna us ARP bolts and Felpro mls gaskets.

Well, if you were a betting man, your money would be on part of the right chips. So far: two blown head gaskets and both heads are cracked. Cracked right between the valves. Block, so far, seems ok. It does have those triangles touching each other and the casting number looks like 04 26...

Looks like I found where the engine came from. Its an AM General motor. https://www.real4wd.com/zedSuite/catalog/partdetail.aspx?PartNo=5744918 Part No.: 5744918 I spoke with them, they said all their stock comes from AM General directly.

YES! I can see the valley and "506" with dots that make up the numbers. Three horizontal lines with dots that make up the lines on each side. Almost like it was printed with on old dot matrix printer, only a dot matrix printer that prints on steel. Not quite sure what the "long run" quite...

Thanks guys, that is good info. I wish I hade time to do this myself but the mechanic I have now seems to be well versed. In fact, we already discussed the ARP blots and Felpro mls gaskets. He also said to go ahead and make some other "while you're in there repairs/replacements" just to be...

Hello, new here but hopefully you can help. Got a 6.5 turbo (center mount-H1 Hummer). Primarily, began loosing coolant, low coolant light. Added water and notice coolant is nasty brownish greenish foamy gritty water. So flush, 6 times, new coolant. Now getting some erradic weird temp...