Thanks 1FastBrick, I was trying to see if there was a major difference in the distance between the ring and the pin, maybe due to compression difference. I wonder if these aren't Mahle pistions which would be better, the delipped LB7 or the Mahle non-forged?LB7 LLY 6.6 Duramax Diesel Rod and Piston Assemblies 2001 - 2005 | eBay
Used rod and piston assemblies removed from many LB7 LLY Duramax Diesel part outs over the years. 2001 2002 2003 2004 2005 LB7 LLY DURAMAX DIESEL ENGINE PISTON ROD. Rod Cylinder Piston. Piston Numbers vary based on engine Model.www.ebay.com
Here is a used LB7 piston. Does this answer your question?
For the LBZ/LMM they redesigned the piston and added a pin bushing to the piston. But they also went to a different manufacture to make them.
The Coated skirts is standard on the LBZ and up when they changed piston manufactures.
Most likely. I had read an article that GM switched to a South Korean piston manufacture for the LBZ/LMM pistons manufacturing.
Did i mix that up with the LB7/LLY? i swore Guy told me it was LBZ/LMM but that was back in 2011
Maybe manufactured for isuzu but the ones you can buy from Mahle are not the same.
Mahle makes a couple of different style pistons. They have the OE pistons, and they have the race cast pistons. I’m not sure if the aftermarket stock replacement Mahle pistons are the same as the OE pistons or not. Maybe someone else can answer that one.
They are not exactly the same.
That's what I assumed, but since I've never compared them side by side, I didn't want to say for sure one way or the other. For all I know, GM changed to a different manufacturer for OE replacement LB7/LLY pistons after going with someone else for the LBZ pistons. All I know (from what I have been told by trustworthy, reliable sources) is that the pistons GM/Isuzu used to originally build the LB7 and LLY from 01-05 were manufactured by Mahle, and they changed to a different manufacturer starting with the 06 model year (including the 06 LLY).
GM did the same thing on the LS motors. The early ones were manufactured by Mahle and later they switched to a different manufacture when they started coating the skirts then they switched to a floating pin rod. I have pictures of them some where. comparing the underside of the castings and the OE marks on them.
