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It still has bubbles. The head shop pinned the cracks between the valves but in one location they did not install the pin under the valve seat. It's outside of the combustion chamber, it only sees exhaust pressure. The engine runs perfectly otherwise and consumes no coolant so I'm just going to...

I have received the newest generation of MLS gaskets. They have embossing around every coolant passage and bolt hole. I also used ARP studs but I'm not sold on the advantages vs TTY bolts.

I think these heads are expected to crack. They're relieved between the valves so they crack in that region where it doesn't do any harm. I see this on large turbochargers. It's called stress relief cracking. I really like the idea of MLS gaskets. Quadstar Tubing claims to have a new version...

That head had 3 cracks pinned between the valves. That's likely what you see. I got the driver side head off today. It was clearly the leaker. I used a Cometic MLS gasket because the two 6.2/6.5 engines I have opened all had damaged top decks from vibrating fire rings. Anyways, I seems like the...

Long story, I bought a 2001 C3500 6.5 engine off eBay. It was supposed to be a runner but I decided to reseal it regardless. Good news is that a teardown revealed it to be a 2004 GEP engine. Bad news the block has 0.010 of wear from the head gaskets. I had the heads gone through and the block...