I am pretty sure this has been asked before. I noticed that there are 1417 pages that I could comb through but after about 205 I decided to start a new thread. I am thinking about taking my cousins HO 4.0L Engine off him and stroking it to 4.7L. His XJ got rear-ended bad and we pulled off anything that was useable. I currently have a 4.0L in my XJ now. I was wondering if anyone on this forum was from California and knows if stroking a 4.0L to a 4.7L will pass smog or not. I am not ready for my XJ to become a Trailer only Green Sticker Ride.. I kind of like driving it to work once in a while and to the trails.

 

There's a nifty search option at the top of the page.

Everyone would probably need more details, like what year is the engine. 91+ is usually better about emissions.

 

Big question for any one. Has any one put an lt1 in a jeep yet i am ready to give it a shot and have fun diong it. Done plenty other mods but not yet an lt1

 

The HO 4.0L is out of a 93..

 

If the fuel/air mixture is set right, the stroker shouldn't have any trouble passing emissions. Visually it'll look like a stock 4.0L, so the only thing you'd have to worry about is the sniff test. If the fuel/air mixture is right, and timing is spot on, you shouldn't have any more unburnt hydrocarbons coming out the tailpipe than a fresh 4.0. Hell, a rebuilt stroker will likely pass easier than your current engine, just do to wear.