![]() The LML was completely redesigned for its debut in the 2011 model year. ![]() This causes hot spots to form on the weakest part of the piston, which can lead to cracking. The LMM had six, which meant that two streams of fuel came out in opposing directions over the piston wrist pin. However, the LMM pistons were liable to break even easier. That was one area of problems, but the other area was with the pistons.Īs mentioned above, excessive mods to get more than 600 horsepower can cause the LBZ pistons to crack. Mechanically, the LMM Duramax was almost exactly the same as the LBZ, but it included emissions control parts that the LBZ didn’t have. The debut of the LMM engine coincided with new requirements for emissions control parts. ![]() Provided you spend $20,000 in mods to exceed 600 horsepower, you might encounter an issue with pistons cracking. The only other minor issue is one found by expert tuners. Fortunately, it’s one of the Duramax diesel parts that can be added easily without spending a ton of money. The only real issue is something that GM simply didn’t install: a factory lift pump.
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