They are both very, very good engines. Other than potential headgasket leaks on the M104 and harmonic balancer on the M112, either one is an exceptional engine. Be on the lookout for these two things, though.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record