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Re: 2.2L opposed to a 2.4L
The more cubes the better.
The 2.2 engines that I know of (unless Chevy has updated the later 2.2 engines) have been an 8 valve design w/push rods. The 2.4 is dual cam w/16 valves. Way more performance and better durability w/the 2.4. I have seen some 2.2s that developed oil pressure issues and ended up wiping out the cranks. Then again, just to change a water pump on a 2.4 is a pain-in-the-ass job. The water pump runs off the cam chain, so the timing cover has to come off and the chain has to be removed ($35 water pump, $350 labor).
If I had a choice, I'd get the 2.4. If you're looking to do some performance mods, there are performance cams available through GM Performance. You could also do the Ricer trick and install a turbo kit. I know it's big $$$$$s, but it would sure fly. It would be a waste of time/money to mod a 2.2 anyway.
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