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I use a paint pen, mark the socket, place the socket on the bolt, mark the head 90 degrees from the socket mark, then hammer the bolt home (I do the heads with impact wrenches on the Cat 3500 series engines).

The GM service manual mentions cleaning and applying sealant to the bolt threads which implies reusable. I think the confusion comes from this other paragraph. GM wanted the bolts replaced with a new longer bolt, not because the bolts are TTY.

I have honestly seen zero proof that ARP studs perform better than TTY bolts. If the bolts are not TTY then studs may perform better. Has anyone confirmed that 6.2 head bolts are actually TTY? Torque angle and TTY are not synonymous. I believe the head bolts on the 6.2 are torque angle and not...

The pre-cups are supposed to be a light press fit. I have seen a center punch used to improve the fit of the cup. Pick two spots outside of the fire ring of the head gasket just outside of the precup bore and mark two indentations with the center punch. This will retain the precup.

I've reused head bolts successfully on the 6.2 engines. The key is renewing the sealant on the threads and the lubricant under the head.

Mine did and I'm very confident that it was original.

The intake bolts should not have sealant. I do see silicone on the water manifold gaskets which should not be there. The fuel supply hose is certainly not original. The manifold gaskets are marked like Fel-Pro but the don't have the plastic locating pins on the ends.

You're symptoms are exactly what happened to mine. It ran that way for a few thousand miles and then started getting worse quickly it blew out the water passage at the end of the head gasket, that's where almost all of these go. Option 2 is a crack between valves. I have seen these pinned. I...

When you buy the test kits you have to buy a special fluid for diesel engines. They don't have less CO2 in their combustion products than gas engines. With that said, the only time I have tried to use a kit was on a Cat 3512 that was blowing bubbles. The test never indicated anything. We used...

That's exactly what my 6.2 was doing. It would push coolant into the reservoir when running but would hold pressure for months when the engine wasn't running. This kept it from pulling coolant from the reservoir. It ran this way for quite some time but gradually got worse. Disassembly revealed...