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Lock-N-Stitch has a repair kit for these engines. You'll need to dye pen the cracks to evaluate the severity. I retired my 6.2 block because of this cracking. After sitting out in the rain the rust shows the extent of the cracks. One nearly crossed the main bearing oil passage.

They were $32k in 1980's dollars if I remember correctly. Not a cheap truck.

That engine looks fresh. I'm surprised you have no head cracks and the pre-cups are so bad. Is your pump turned up or something? Does this thing run petal to the metal all of the time? I've moved on from head cracks. I'm convinced the head is relieved between the valves to cause it to crack...

The key is to assume no coating can be 100% defect free. Zinc based coatings are the only ones that can protect a defect. You best system would be an inorganic zinc coating with calcium sulfonate wax topcoat.

If you can get an accessory rack from a 1996+ 6.5 engine it has dual alternator brackets AND an A/C compressor mount. This let's you keep your wiring harness unmodified. There are plug in adapters for the SI to CS alternator conversion. Downside is that I haven't been able to find an isolated...

GM has been using gelled calcium sulfonate as an undercoating lately. It's self-healing and can be applied to marginally prepared surfaces. https://www.daubertchemical.com/store/product-list/corrosion-prevention/nox-rust-x-121b It's wax-like so you don't want to use it in places it might rub...

The heater just needs power. If it's present your current power circuit will run it. I think the WIF sensors are continuity based so any filter that uses a continuity WIF sensor will work. Some filters use floats and those may work but I'd have to do some investigation on that. The float closes...

I just had a Cat 3516 with an intermittent no start. We noticed a hard spot while cranking. Identified cylinder 16 as being at TDC during hard spot. Pulled the injector and found a rolled o-ring. Cat wanted to replace all injectors at $1500 a pieced plus labor.

On a closer look of the left pic I see a third crack. I would also condemn that pre-cup as that could allow a large piece to break away and damage the cylinder.

In the right pic the pre cup is starting to lose material. That's bad. Do replace that one. In the left pic, that cracking is normal. In turbo machinery we call that stress relief cracking. The general rule is that you don't want the cracks to extend across the head gasket fire ring. I think...

The 1/2 ton springs are the wrong length. A 1/2 ton has 3 leaves, the K30 has 10. I think I'm going to remove leaves and then use 2" lift blocks.

A stripe at the end is all I want to see. IEEE45 cables are often not color coded by usual standards (red is ground for single phase AC) but will have a number and the color printed in letters on the wire. I guess this isn't enough so many will tape the entire length of the exposed wire. I hate...

I want to convert my M1008 to a 1/2 ton while maintaining height. I can't find a shop that will re-arch springs. I'll need to take 7 leafs out which causes significant height loss. Maybe it can't be done? My engineering background says this practice shouldn't be possible. Guess I'll use blocks...

Water shooting out? Engine is dead. You don't get a lot of time from when a cylinder fills with water before you must have the engine running again to prevent corrosion from causing irreparable damage. Pull the heads ASAP for the best chance of saving the engine if you can't start it.

How do you feel about the 6L80? It seems like it would be an ideal alternative to the Allison.

I do quite a bit of electrical work from time to time. My industry isn't very regulated, oddly. There isn't exactly code but there are standards. The standards do explain how to do things correctly and is simple. IEEE 45 is our most relevant standard. Everybody tapes cables where they strip them...

The more gears the merrier. The direct injection diesel engines of yesteryear had very narrow power bands, basically 1800-2300 rpm. It took a lot of gears to keep it there which is why big diesel trucks have 18 speed transmissions. The 12V Cummins engine isn't quite so limited but they still...

With the exception of the volt meter I believe all of the CUCV dash runs in 12V

I usually do one pass with the roller and then tip immediately.

Try roll and tip. Apply with a foam or shirt nap roller and immediately knock down the orange peel with a dry brush.