Aug 10th 2005 the motor broke the crank, I posted pictures of the rebuild http://http://www.dieselplace.com/forum/showthread.php?t=47988 and havn't talked much about it since then.

What happened was this:

The oil passage just passed where the guage sits at the rear of the engine going to the lifters and cam was clogged with dirt! and a little metal screen. Luckily I pulled the engine before any major failure occured besides the lifters and cam bearings.

To get the truck running again I put in the original 599 from my '94 after cleaning, honing and bolting it all back together, with all the parts from the first engine, including '98 van heads I drilled the valves on, Delta re-grind cam, new injectors, ect.

So far I'm most impressed with the cam. It builds boost faster (12 psi @ 1800 rpm unloaded) due to the exhaust valve hanging open longer and is a noticable change in sound/power. As soon as the engine has a few hundred miles I'll post the hp and torque numbers the scantool spits out. I'm thinking of putting a reground cam in my truck:)

The 599 has been in the '96 and running for a few days as I timed it on the AE scantool and worked out the few last kinks and I'm surprised at the balls this engine has now. I'll post a picture. I painted the entire engine chevy orange, he he

Chevy orange, ooooo :cool:

I painted the entire engine chevy orange, he he

That's worth another 25 HP you know.
:lol:

keep us updated on this please.

Does the 6.2 and the 6.5 use the same cam? I was wondering as I'm building a 6.2 with a Banks turbo and would like a better than stock cam.

where and how much was the cam? do you just sned a core and have it ground?

6.2's and 6.5's use the same cam.

Doesn't it make sense to paint the engine AFTER the heads are bolted on and the tin is all there as well? :rolleyes:

If I understand you correctly, the screen I think you're taking about in the block is actually a cup plug. From the bottom side of the block in one of the "extra" holes underneath the rear main bearing cap is where it resides. You can only get to it from the bottom. It's no screen, and should be removed during a vatting, because crud get's stuck in there and there is no flow there for the hot tank vatting to get to. This plug has to do with the oil cooler circuit.

Delta cams out of Tacome Wa. sells the regrind for $150 w/ core exchange and $200 w/o. I posted the valve timing vs. stock about a year ago.

The heads were already orange and had the injectors in them, so I painted the bare metal of the block to match.

The screen didn't belong where it was, and I feel the machinist we payed $1100 to clean, bore ect the 529 should have cleaned all the oil passages when he hot tanked it, as he said he would.

I have been able to drive the truck some more. For those of you who don't know, it's a '96 CC K3500 Spring WG, guages, IC, and a freashly painted 599 with a hot cam, head porting including opening the precup toward the piston center and porting the intake and exhaust, drilling valves and a .010" headgasket with ARP headstuds hoding it down.

I just put rebuilt engines in two trucks and I have come to the conclusion that my ('94) truck isn't as much fun.

When I drive the '96 I can make the hood lift up at 2000 rpm and hold it with ~10 psi boost, the '94 is only hitting 2 psi at the same RPM/acceleration and the hood doens't lift(wtf?)

I'm pulling the engine back out of the '94 so I can put in a cam too.

If you're wondering what it sounds/drives like, the closest thing I can compare it to is a cummins. Any amount of throttle seems to make it jump (literally) in RPM/boost and go. This engine wants to run!

I did a WOt accel and burned the tires from 0-30 (I let off after third gear) and held 20 psi boost. This truck has the stock Eprom and a 5521 IP, and a stock gm-8, It can only get better with better parts. Does anyone else here want to make 500 hp and live to dive home?

This is the point at which the 6.5 goes in two distinctly differnt forms. With a cam and without.

If any of you guys are interested this is what I'd like to do now. I have another 6.5L block and I'd like to put a billeted steel crank with .020" offset rod journals cut to lower compression and get passed the crank failure rate. Couple that with a main stud/girdle, ARP headstuds, a little porting and the hot cam and it should be ready for 99mm3 fuel rates.
Are you reading this CR?

Great QM,
Have you found a source for that crank or figured out how to make that happen?

Yeah i'm reading. Crank will be an expensive piece unless you know someone, a billet crank with the new hummer block, splayed mains should be indistructable, the weak link will be the gap in the head bolt pattern.

Whats your truck weigh? I still can't light em from a standing stop!

On Edit: Actually a better question would be whats your truck weigh on the back wheels only?

The truck is ~7590 -8500 lbs, I've never weighed it without a trailer. Another thing I had considered was $300 for a local machine shop to weld and hone the .020" rod juornal offsets but that still leaves you with a ticking timebomb under the hood. The billet steel crank may cost $1500 to make or more but that means I could have a finished engine for ~3,000-5,000 starting with a good 660 or 599 core, and the future is to cast your own block, can't trust the greedy monkey to get that one right.

On the topic of increased headbolts, the block can support 5 more head bolts per side as is but that would require a custom head. My experience so far with opening the precups toward the piston seems positive and a new injector angle/location relative to the piston face may do wonders.

After I get finished with upgrading the cam in my daily driver ('94) I may get to help put a cummins in a chevy and hey, who knows what's next after that, but I'd like to build another motor (I'm on a roll why not?) and hook somebody on this forum up with it, anyone interested?

To be eligable you have to realize it's not really a gm motor anymore and they may refuse to even time it!

It will be anything but stock and if you don't care for a new level of performance, what's the point?

It will be chevy orange

I think if i was gonna get someone to build me an engine i would get to have the color choice of the block!:D

:) It really doesn't matter as long as it's not black.