I don't know if it is available that far back, but with my '03 I just had to get on the Jeep website and email them the last 8 digits of my VIN # and they sent me a 4 page build sheet that showed EVERYTHING that was on the Jeep. It was pretty neat to get and it only took about 4 hours to get it!!
Here ya go george, a little searching and wikipedia here's what I found!!
"In 1991 Chrysler Corporation, then the owners of the Jeep brand, redesigned the RENIX engine control computer and raised the intake ports approximately 1/8″ for a better entry radius. Chrysler also enlarged the throttle body and redesigned the intake and exhaust manifolds for more efficiency, and the fuel injectors were once again replaced with higher flowing units. The camshaft profile was also changed. The net result of all these changes was an engine that made 190 hp (142 kW) and 225 lb-ft (305 NÂ·m) of torque. Badging on Jeeps equipped with this engine read "4.0 Litre HIGH OUTPUT". The new cam profile combined with altered computer programming eliminated the need for an EGR valve and knock sensor, but make the engine more sensitive to alterations, especially where emissions are concerned."
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