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I was having a conversation elsewhere on this site and came up with another question. The 6.2L intake manifolds on the HMMWV's are lower profile, correct? How do the diesels react to the profile of the intake manifold? I recall on my Chevy 350's and 400's in the past that I always swapped out...

I thought Propane Injection had cleaning, mileage, and performance benefits, as well as being necessary on any diesel if Nitrous Oxide was intended to be used? Could you elaborate on your reasoning for staying away from the Propane? I am interested on this too, particularly some of the...

I to am a fan of the Cummins BT's, but this thread is about what CAN be done to the 6.2L GM Diesels to improve on their design. Most people, instead, do as you suggested, keep the 6.2L stock, or pitch it to the curb for a transplant. That reasoning alone is one of the main reasons I started this...

Honestly, I don't know how helpful this is so far, but I can say it is a start. Another member mentioned we should build a database on the 6.2/6.5 engines, and that this database should include casting numbers and whatever information we could gather so that we can try to figure out the various...

Could you share what casting numbers they have and what, if any, noticeable differences they have? Pictures of any differences would be helpful.

These guys are absolutely correct. Reusing head bolts is a bad idea, they have a tenancy not to hold torque, plus you most likely have no idea how many times they have already been reused in a shade tree head job/gasket change in the past. The ARP studs are a worth while investment. They hold...

Makes me want to go out and look at my engine tomorrow...

How do you tell the difference?

Now that is something to consider! I guess a starting point would be to make up a database with all of the available variations... Then hopefully we can find folks that have ran at least some of the combinations for feedback on there results. Now it's getting even more interesting.

I haven't seen the exact post you referenced, but similar information is available in another thread on that forum that I have been reading. http://www.dieselbombers.com/6-2l-6-5l-performance/68582-6-2-performance.html The fuel mileage is another reason I am interested in the 6.2L. I am more...

I am planning to look into the books soon. As for the dead horse... I am actually surprised that it took 26 post before that came up! And I fully agree with you on the P-Pump Cummins (4BT or 6BT). Personally, my favorite diesel is the 6BT as they are simple to deal with, easy to tweak and tune...

I did some more searching on the P400. Redundancy and inadequate information is what I came up with. So I decided to contact AMGeneral directly, we'll see what kind of response I get. Here's the message I sent, hopefully their eyes don't glaze over!

I have access to a '96 C3500 SRW with the 6.5L / 4L80E in it (snapped a crank due to harmonic balance failure). The body of the truck is junk, but the drive train only has about 105k on it. I am curious, what all did you have to pull off the 6.5L to make the "kit" to put the turbo on your M1009...

The twin setup with a smaller turbo, then a larger turbo is something more along the lines of a tandem/series set up. And you are right, in that case, there would be no point of having a turbo over supercharger setup. The series turbo setup works out pretty good on an inline engine like the...

One is belt or gear driven, and the other is exhaust driven. The turbos are easier to play with when it comes to choosing your ideal boost range. You need to synchronize them so that they compliment each other instead of fighting against each other. Each of them will make boost at specific...

Any idea what size studs the heads are set up to run? I'd opt for 7/16" ARP studs and fire ring the heads with the 0.010" thicker head gaskets cut to match the fire rings. Also, why the HX35 turbo? Why not run parellel twin turbos plus a supercharger? Optimize the engine for both low RPM Torque...

It would appear that the marine application has a higher HP rating, and comes in both supercharged AND turbo charged variants. I still haven't found a "where to buy" link yet, nor have I found out if a "crate" engine is available (e.g., complete engine with computer and harness set up for...

That is very interesting, I have converted the article to PDF and attached it. Really good information on the cylinder heads. But I need to look more to see if this block is publicly available, or if AM General is hold in on to it tightly for military use.... The best block is useless to us if...

I'm intrigued. What is this "optimizer" block? And what is it about this block that makes it superior to the J- Code block? My focus on the J block is due to availability more than anything, and the fact that the CUCV is already designed to use this block without modification, and it can be...

I did not know about those books. I will have to look into them. However, I still like the idea of getting a one stop shop for information set up here. Ever since I bought my XM211, this site head been my first stop for trusted information, an continues to be the first place I look (after the...