I doubt the 91 has a real EVAP system but it might have a canister. They only way the inspector knows what to check for is to look on the sticker on the core support.....lose the sticker!

LOL.

A '91 is a square body R/V not a C/K and is pretty caveman like as far as emissions goes. It has an EGR as well as a cat (the old 6-sided sucky ones). It has other things you don't want too like EST, etc. The good thing about non-emissions counties in TX is that you're gonna put a newer style engine in and it only has to have what the engine had.....and since they have reduced the number of emissions devices since the beginning of the LS engine series, you can SAY it's a newer non-EGR engine. If you're not in a sniffer county all you have to do is find a dumbass or slip a friend a $20 to overlook mods that should fail visual...