I wonder if it's worth mentioning to the tuners if you're running a different pump or not... not sure if it's even something to worry about or not. I've heard the 03 pumps run lower PSI than the newer one's.

Good on you for thinking outside the box like this! :rocking: I've heard it over and over that te 03-07 short block was all the same. That being said, it only makes sense that with a little parts swappage, a newer HPOP would fit in an older block.

If I ever get around to doing this, I would certainly mention this to a tune writer. Sorry, MDUB, "tuner" sounds like a punk kid in a Honda that needs to pull his pants up. :bat:

Info like this is why I enjoy this forum so much. :tu:

Hi Jim, got that baby all hooked in. It was awesome- we removed the rear cover like you said put in the06 branch tubes and the06 hpop fitted in like a baby. Now my next question- are those dowel pins that go through those branch tubes?

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Another quick question. Should i put the 2006 heads on the 2004 block or should I use the 2004 heads? I'm in the middle of putting this engine together and its my first time so I need all your help.
Thanks in advance

I think they are called stand pins or tubes. One is from the 2004 and one from the 2006 block.

You need the 06 stan pipes. You dont need the early style. If i was that far in and the 06 heads was known to be good heads i would stud them down and use the 06 stan pipes and hpo rails with the relocated icp sensor and rocker box covers.

Oh and you will need a 18 to 20mm dowel kit along with 20mm head gaskets.

Jim, This advice is worth a million! if you're ever in my neck of the woods the limo ride is on me! I'll be tearing into the engine tomorrow and after I get the 06 heads cleaned, fluxed and pressure tested - i'll let you know my progress and for a first timer there are going to be a lot of crazy questions posted along the way. Thanks for all your time and effort.

To put the 06 heads on, you need to know if they're 18mm or 20mm, if they're 20mm heads going on to the 18mm block, you'll need the correct gaskets (you can order 18mm or 20mm gaskets, and the adapters come with the gaskets now), you'll also need the rocker boxes and injector hold downs for the corresponding heads, they're all different.

I'm going with the 06 heads on the 04 block. As soon as I get a clean report I'll be posting the pics and the steps being taken. Somewhere in this forum it was mentioned that the glow plugs cannot be interchanged because of a length issue and that they will impact a piston. I am not clear as to how that would happen. The glow plugs from the 04 and the 06 were the same length.

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Got word from the machine shop and looks like my 06 heads are both toast. The exhaust valves were cracked all the way through - that was a bummer. So I'm going to give them the 04 heads and see what the report on that one is. I have sent the 06 injectors and 06 turbo in for a check. The injectors will be tested for $50 each and if they are not found to be at spec they will swap them out for reman ones, which I thought is a pretty good deal. Will keep you all posted

The glow plugs were probably the same length because you probably have the older heads, just like on my 06. They didn't go to the 20mm heads until mid-06. My build date was 11/05. The newer stuff is all different.

Who and where did you send the injectors? What is it they're checking for? I'd be REAL leery of reman injectors FYI.... nothing but horror stories.