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I re-read Chad's post. The LP is good. Chad - the OPS in my engine was a brand new AC Delco unit bought from my local dealership. There are no chinese sensors on that rig....just Delco. You will want to check the wiring harness....like you said, you must have pinched something cause it was...

Here is how the GP override worked... http://www.thetruckstop.us/forum/showthread.php?t=5440 As you can see in the pics, the bare wires were tapped into the fused side of those two fuses in the block. Those were later replaced with add-a-fuses for a cleaner finish. I took the add-a-fuses...

No worries. I am not offended. Some of the issues you are describing were there when I first got the truck and I didn't really put in any time to fix them. I will try to help you out here - the wire hanging in the fuse box is a power wire (I believe for the GP override, but can't remember...

You should probably turn the boost down a few psi as well. I found that the ISSPRO gauge was off by about 3 psi at max boost (the gauge was reading 15, but actual boost shown on a scanner was 18 psi). You saw what happened to the last engine....

The 506 should be ok. Keep an eye on oil pressure and coolant temp as well as EGTs. I never once had issues with overheating, so I am sure that you will be ok there...might want to blast the rad out to make sure it is perfectly clean. It was about a year or so ago that I did it last. You...

Looks like a glow plug override....have to follow the wires to be sure....

I found my DMAX....

Doesn't that convert to 242 HP?.... Not bad for an old 6.5...

If that doesn't work, I would run through all of the fuses and make sure that they are all good. Check the wiring harness that runs by the A/C accumulator - chafing is known to happen there. Next, pull off the upper intake - this will give you a chance to check out the supply line from the...

Go big or go home.....I went big.... Seriously - I thought that the worst I did was lose the #8 con rod....turns out I split the block in half....LOL! Told you it needed a new engine...

LOL.... Just like Hotel California...

Oh I am Slim.....guess you didn't see me welcome him here.... There have been 6.5's turning more than 425 HP before....a few of Bill's trucks and a couple marine 6.5's come to mind... Thought I would point out the obvious humour though....1st post and churning the pot....I'll just grab...

I love it when guys start off with a joke...I can appreciate a good sense of humour....):h Welcome to the site Rush....

Nothing on my farm gets an easy life....every machine is expected to pull its own weight.... I do agree though - more and more of these trucks are just seen as grocery getters for the guys in the burbs...sad really...

People laughed when I said that I would 'boost my crankshaft into the ground'.....I came damn close didn't I?

Gear? I wasn't paying that much attention...put it in gear and drive... If I knew it was going to blow, I would have taken notes....

You will never go back Ian.....trust me! The 6.5 is a fun 'budget' diesel, but the DMAX is in a whole 'nother league...

Hey Ian! Check out my sig - blew up the 6.5 and am now running an LMM... You already know how to get to 350...:thumbsup: