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  #31  
Old 03-06-2009, 05:25 PM
redbird2 redbird2 is offline
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Join Date: Jul 2005
Location: IL
Posts: 242
Unhappy Update Not Good

someone asked the head is fine however the block is not good anyone happen to know where I can pick up a good LB7 Block or tell me a machine shop that can bore this block,

I received a call from my machine shop (being using same guy 20 plus years) the block is what they referred to as leopard block around the top of the cylinders thye have induction hardened the place if you look at it they look like leopard spots. they called there machine shop resource asking about a bulletin that they have that shows you can not cut this with a boring bar. He asked how they are over sizing this engine he was told they are honing to the all the way to the over size how ever to install a sleeve they would have to take .125" all the way around to make a sleeve fit that is if they can find a sleeve for this engine no one list a sleeve for it e told me the names of the sleeve companies one i think was LA sleeve not sure about the other was in to much shock to find out I can not fix this engine. the industry resource told him he did not know of anyone sleeveing a Duramax block he figures its being done just not sure where.

so anyone has a good LB7 email me or if you know some one that has sleeved one of these blocks point me in there direction please everyday the truck set I lose money guess I guess night have to bit the bullet and by a used engine I found $4000 with 112K on it with a warranty.
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2003 CHEVY 4500 DURAMAX/ALLISON 14'
SERVICE CRANE BODY 16,500 LBS 14.5 MPG
1998 K3500 SRW CREW CAB TRANSPLANTED 6.5TD ELECTROINC INTO, HEATH COMPUTER, 40+HP INJECTORS, 4" EXHAUST, VACUUM ELEMTINATOR ON TURBO,UPGRADED COOLING WITH ALL GM PARTS,NO VACUUM PUMP, SST OIL COOLER LINES MADE LOCALY FRACTION OF THE COST, 3" TOURBO/BOOST GAUSGE ALL IN ONE, ADDED GEAR DRIVE GREAT HELP WITH STARTING TIME DOESN'T JUMP AROUND ANY MORE, INTERCOOLER 3" INLET AND OUTLET COOLER 12x24x4, ALSO ADDED MANDEL BENT CROSS OVER, HAD TRUCK REPAINTED AND OPUT ON ALUM FLAT BED
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  #32  
Old 03-08-2009, 06:41 AM
Mark Rinker's Avatar
Mark Rinker Mark Rinker is offline
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Join Date: Jun 2003
Posts: 5,813
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Well the engine had to come out, anyway.

My advice would be to spend the time looking for that low mile 2003 early 2004. Don't get in a hurry, and buy a high mile LB7 engine from the lowest cost supplier, only to find out later it was a 2001 with a smokey set of injectors.
  • Know the year and VIN of the engine;
  • Know the miles and circumstances on the donor truck (no rollovers - they might have run/sat upside down and hydrolocked);
  • Know the injector history by running the VIN with GM.
4K for 112K mile engine is no bargain, if you ask me, especially if you are doing headgaskets and/or injectors this time, next year!

Be patient get on the internet and phone - call Kennedy Diesel, call the Performance engine builders nationwide someone has what you need for the right money, in this TIGHT economy!!!

I got lucky a few years back and found a new LB7 that came out of a 15 mile truck. Thats right...fifteen miles... Paid $5K for it, complete, was going to swap it into my high mile 2001 with head gasket issues, but decidede to sell the truck, as-is. Later sold that engine to another DP member for $5500 IIRC...I knew it would only be worth more and more - but the cash money was nice, too. Here is the guy I bought that engine from... http://marineduramax.com/6.6-liter-turbo-duramax-diesel

Good luck!
__________________
2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K

Last edited by Mark Rinker; 03-08-2009 at 07:03 AM.
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