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What would you do??? I have a 90 yj with the 4.2, mc2150 an the GM dizzy. Trying to get the best bang for the buck. Should I do the 4.0 head swap? Iv heard its awesome and that its not worth it. Get a mild cam and new timing chain or a 4.0cam? Both? I like the carb setup. Fuel injection might get more pricey than i wanna get, an what all do i need to do it? What do ya think?
 

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Lots of info in the forums on this..... Do the head swap. It is good for 40-50hp which equates to best bang for your buck. You can also go with a more agressive cam and replace your timing set while you are in there.
 
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