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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.


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Old 01-15-2020, 05:02 PM   #1 (permalink)
farmertracks
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GM crate motor updates?

Long story short. Bought a 2006 4 door long bed with 65k miles in October. Middle of December 400 miles from home, cracked a piston. So, looking at options. My question is, does a new GM crate motor have updated pistons that are not prone to the same issues?

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2006 GMC, LLY, extended cab, longbox, 4x4, ZF6 manual tranny, 5 inch straight exhaust, AFE stage II intake, EGR blocker plate and fingers stick, PCV re-routed, de-badged, chrome handles mudflaps etc, approximately 20,000 miles......averages 22 mpg

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2001 2500HD extended cab, shortbox, 4x4, 6.0L with NV4500, dual 3 inch straight exhaust, chipped, custom intake, chromed out.

1985 half ton, 4x4, 6.2 diesel, bored .030, girdled, ARP head studs, GEP diamond pre-cup 6.5 heads, DSG timing gears, performance cam, banks turbo kit with Duramax intercooler, custom built injection pump with a lot of fuel. PCV re-routed, NV4500 tranny with mechanical clutch linkage, dual straight exhaust, 6" lift, 3:42 gears, 32x11.5x15 tires, 450,000++ miles.
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Old 01-16-2020, 07:45 AM   #2 (permalink)
Rvn4me
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What is your HP goal?
Some trucks crack at 450rwhp for no reason, others last at 600+ rwhp with no problems.


Last edited by Rvn4me; 01-16-2020 at 07:46 AM.
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Old 01-16-2020, 11:00 AM   #3 (permalink)
farmertracks
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I do a lot of pulling. I'm not after big HP numbers with this pickup as I have my other toy for that. Im really only asking about the new long block from GM wondering if they have updated the pistons. Just don't want to run into the same thing again because it's the exact same piston.
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2006 GMC, LLY, extended cab, longbox, 4x4, ZF6 manual tranny, 5 inch straight exhaust, AFE stage II intake, EGR blocker plate and fingers stick, PCV re-routed, de-badged, chrome handles mudflaps etc, approximately 20,000 miles......averages 22 mpg

Also:

2001 2500HD extended cab, shortbox, 4x4, 6.0L with NV4500, dual 3 inch straight exhaust, chipped, custom intake, chromed out.

1985 half ton, 4x4, 6.2 diesel, bored .030, girdled, ARP head studs, GEP diamond pre-cup 6.5 heads, DSG timing gears, performance cam, banks turbo kit with Duramax intercooler, custom built injection pump with a lot of fuel. PCV re-routed, NV4500 tranny with mechanical clutch linkage, dual straight exhaust, 6" lift, 3:42 gears, 32x11.5x15 tires, 450,000++ miles.
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Old 01-20-2020, 10:32 PM   #4 (permalink)
TheJDMan
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Why not just have a Duramax shop rebuild your engine with good pistons? That way there is no question.
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2007 Silverado Classic 2500HD 4x4, EC, SB, LBZ, Allison 1000 6 speed,BD LH Exhaust Manifold, EGR Delete, EFI Live DSP5 tunes by Duramax Tuner, Diamond Eye 3" Downpipe, Banks 4" Monster exhaust, Banks 3" Intercooler tube, AFE Turbo Inlet Tube, Kennedy dual lift pump, Bilstein shocks, 275x70-17 BFG T/A KO2 on 17x8.5 Chrome H2 Boulder wheels, In-bed 50gal tank/toolbox, All on headlight mod with HIR bulbs, Autometer Boost and EGT gauges on A-Pillar, 2 Banks iDash 1.8 monitors.

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Old 01-21-2020, 10:59 AM   #5 (permalink)
RickDLance
 
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I've seen bone stock telephone trucks in the shop with broken pistons. I think the aftermarket stuff is a little stronger. May want to consider Fingers pistons.
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