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Just thinking that I've seen some with obvious scuffing, and I don't have that.

I push this motor hard, but water temps and egt were kept in the "safe" zone. Full crosshatch and no scuffing in the bores.

Noticed a small stream of bubbles in the expansion tank. Tore it down this week and SURPRISE, four matching cracks in the head! Can't wait to pull the other side!

I assume the quest here is to lower IAT/EGT. Few would probably want to follow my path on this, but in my experience it is important to cool the entire engine bay. Yes, I have the biggest Mishimoto cac that will fit between the frame rails and I have a water/meth system with a 14 gal/hr nozzle...

Will, where would that crack most likely be?

Nice work Chris, as always.

Nice!

I just eliminated everything the factory put on the truck for a fuel system. Pressure gauge is pegged because I didn't have it hooked the the regulator yet. It idles at 7psi.

Ouch

Just got my Massey Harris 44 cam back from Blackburn's Performance Shop. Fresh new grind will add .072"int and .076"ex lift (.550" & .560" at the valves) Haven't got the cam card yet, but should be 15-20deg more duration than my current grind.

Holset parts work in my cko turbo. I even have a legit Holset compressor wheel and housing on it. Best insurance against canister going through your engine is an intercooler.

I wouldn't. 400 cubes need to breathe. 12cm minimum, 14 is better. In my case where I occasionally tow heavy in the hills with small tires, 4l80e and 4.10 gears, a 16cm hx40 is in the plans.

Now you won't ever get to drive the 6.5 again. He's already addicted- even if he doesn't know it yet!

You don't need lower compression to move a lot of weight. However, you absolutely MUST keep the engine cool (@200 max), and it is much easier to do with lower compression. Look at TSP's chart (calculations) for cylinder pressure and you'll understand why lower compression allows an engine to...

TSP hit it on the head. I've heard as low as 8:1 on smoker tractors. It's also why I have a self imposed 15psi boost limit on my stock GEP motor.

I'm not sure I know what that is! Seriously Will- when was the last time your foot WASN'T deep in it?!

If I were building a 6.5 to work hard every day (dually w/loaded gooseneck), it would be 18:1, not 20:1.

Yes, and the 6.5 is a more over square motor governed at 1k less rpm.

Absolutely! But let's consider how GM intended this engine to be used- as a fuel efficient alternative to the 350. They decided to set this motor up as a low rpm, lugging slug. They just forgot that it was an ultra high compression, over square design. So the injection pump tuning (peak fuel at...

All plumbed up and ready to go! I hope! I set the initial pressure at 7psi. Hope to have time to fire it up tonight. The truck is away for the winter and as long as everything with the fuel system checks out in the shop, I will start the teardown of the front of the motor to install the gear drive.