Originally Posted by NAVYCHIEF
google 4.0 high putout. wikiup has info
If you are trying to decide on what to buy, I think the choice is easy..FI 4.0! I have the 4.2 Nutter bypass, new carb, HE ignition and wishing I had the 4.0 Don't get me wrong, the 4.2 is a great motor but the 4.0 is better. I know some guy's will say "no my 4.2 will smoke a 4.0....." but if we're talking pretty sock Jeeps, one with 4.2 and one with the 4.0....I would take the 4.0.
This is from a guy with an 87' wrangler 4.2..