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You need to work on those? Why? They never break.
Get the 6 for our American Hwy if not the 4 is Ok too but lack a bit of real oomph when needed going up the long grades out here in the west still, you will be fine. I have had those old 22RE engines in many of my cars and trucks and not a real issue just don't load them up with 3000 lbs of bricks and expect it go fly up the mountain .
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