I assume these are GM 454, 7.4L, gas engines. The '91 is probably "TBI" (throttle body injection). Somewhere later in the 90's, I think the fuel system was changed to port injection, and the engine type was advertised as "Vortec", which had more power and possibly better mileage. This is all from memory, so someone correct me if I am wrong.
Originally Posted by RainCatcher
As I said everything else is equal. The only difference is age & mileage.
George Schweikle Lexington, KY
1999 Safari TREK 2830, FMCA 190830, Safari International chapter
1995 Safari TREK 2630, 1983 Winnebago Chieftain, 1976 Midas Mini