Grand Cherokee Stroker

I am going to be buying my fiancee a Mini Cooper in exchange for her 99 Grand Cherokee. I know I kind of feel bad for taking advantage of her like that. It has the 4.O in it and I would like to get a little more power out of it. At quadretec I saw a 4.6 stroker block for Wranglers of different years but nothing for the Grand Cherokee. Is it possible to buy that long block and bolt on the stock intake and exhaust and other mumbo jumbo. I am sure I would have to add bigger injectors to prevent a lean condition. Also will I have to have the computer reprogrammed? Does the Golen long block have provisions for sensors? Am I better of finding a 4.7 v-8, or trading in the 4.0 jeep for a 4.7? My ultimate goal it to build the ultimate all around jeep for daily driving, work, (pulling small boats on trailers, mobile marine business) and play a little on weekends. With fuel economy a factor but not a major priority. Thank You for your time.  

The stroker is a good idea if you want more power and your motor is worn out. If there is nothing wrong with your engine it's kind of an expensive upgrade though. Check out the Mopar stroker motor.  
John Cappa
Editor
Four Wheeler
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There are stroker kits available all the way up to 5.0.  But as mentioned, they are not cheap.  
Steve  M.

2000 XJ
1983 CJ8 (in progress project)

You'll have the same amount of coin into a stroker 6 as you will a V8 conversion, and a V8 will have more power.  The 4.7L HO is a great engine, it gets between 18 and 22 mpg depending on how and where you drive it.  Yes, I said 22 mpg.  A friend of mine commutes to Flagstaff, 50 miles one way, daily and gets 22 mpg if he sets the cruise control at 63 mph on the way up.

I suggest you test drive a used Grand Cherokee with the 4.7 HO.  If you like it, buy it and get rid of the 99 with the 4.0L.  Make sure it's the HO engine, the non HO 4.7L has 235hp verses 265hp for the HO version. This would start you off with all the engine modifications being completed, then add lift, tires, gears and lockers and you're done.

If you want even more power, but less fuel economy, get a 1998 Limited 5.9L Grand Cherokee.  This engine was only offered for one year.  I have a 1996 GC limited with the 5.2L, the 4.7HO has more power.

If money is no object, install an E-Rod engine from GM Performance.  You'll empty your wallet with a smile on your face every time you smash the gas peddle.  

Thanks guys a lot of good info. I am going to price out the complete 4.6 stoker project to get an accurate $1 per torq and bounce it of the price of a used grand with the 4.7. I have looked at that 4.7 before and I like the numbers. Nobody made any comments on taking advantage of my fiancee either. LOL  

Dude, you're talking about engine swaps to get more power, but have you messed with the 4.0L yet? Is the 4.0L all stock? Before pulling the trigger on a stroker long-block I've got a pretty solid combo that'll get you 20-25hp at the tires and a huge bump in drivability.

Cold air intake, 62mm throttle body, Banks/Gibson/Borla/etc header, after-cat exhaust (the Gibson one is quiet if that matters to you), Performance Distributors 4.0L Firepower Ignition Kit (your '99 still has a distributor). I put those parts on my '99 4.0L XJ and got 20hp at the rear tires. It would've been more if I had programmed the computer to add more fuel.

Point is, if you add the 4.6L or 4.7L you'll need to do all this stuff anyway to support the additional air/fuel the extra 37-cubes of that stroker engine demands. And I doubt if after you've added those mods you'll really see the need for a stroker.

I didn't really notice a monster difference between my modded 4.0L and the 4.6L I replaced it with. Maybe with a '91-'95 OBDI engine, but it's too hard to properly get the fuel into a '96-up OBDII engine. For me, the computer programming seemed to leave too much on the table 'till I did a very expensive dyno tune.

http://www.jpmagazine.com/techarticles/154_0412_jeep_4_0l_power_testing/index.html

http://www.jpmagazine.com/techarticles/drivetrain/154_0512_golen_4_6l_stroker_engine_3/index.html

http://www.jpmagazine.com/techarticles/engine/154_0804_powerful_jeep_engines/index.html