They are both mechanically the same engine. Only difference is a longer stroke on the 3.2L to bump the displacement up by .4 liters over the 2.8L. That is where the extra power comes from.

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Ali Al-Chalabi

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