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Well, us TD guys have found that the 2.5 common block has better torque than the 2.2 because it has a longer stroke but it suffers in the higher end. I guess if you have a 3,300 pound car or more you might need the extra torque, but I for one have a 2,900 pound car and I like having a good amount of speed in the upper RPM range.
I guess it just depends on what you want.
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