catalytic converters
 

My 78 gmc does not have catalytic converters. What was the first year that these trucks were equipped with a converter. How can I find out whether or not I am supposed to have them on my truck?

my 82 had them... not sure about in texas, but we no longer have emissions testing here so it doesnt matter much...

jon

I know in Texas 84 and older do not have to have cats. I passed emissions fine without cats.

wlarue72,

I know that Brandon provided a more practical answer regarding whether Texas law requires cats on your rig. Nevertheless, since other posters occasionally ask similar questions, and since I once wrote an answer to one of these inquiries on this board, I am going to try to post a link to that earlier thread here...

http://67-72chevytrucks.com/vboard/s...&threadid=4408

My 78= no emissions equipment except for PCV valve.
My 79= cats, evap canister, and PCV.

There is a sticker under your hood, by the latch. I believe it tells you if the truck came with a cat from the factory. That sticker is what AZ uses to make sure you have everything you should.

KIIlew, thanks for the info. I guess I will go with the cats to be safe!

Cats
 

Don't put cats on it till if fails inspection ! I want to get rid of mine but need to research it at the DMV before I hack it off and put on duals.