What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

When Did Chevy start using Catalytic conv. in Blazers?

J

jonathanjay743

Registered Member
Joined
Sep 15, 2007
Posts
79
Reaction score
0
Location
Salt Lake City, Utah
I have a 84' Blazer and do not have a catalytic converter, here in Utah if it was on there originally its gotta be on their to pass emmisions. Kinda dumb. Anyway just wanted to know when they started putting them on their Blazers(I hope after 84'). Any ideas.
 
catalytic converters hve been around since the mid 70's. i think you need one. My 85 Federal smog Blazer has one.
 
I believe 1978 was the last year for Blazer 4x4's with no Cats. I own a 1978 GMC jimmy,an original Arizona Truck w/ no cats, and no smog, Just PCV.I believe this is because 4x4's are"Off-Road Vehicles, and does not apply to 2wd's. I also believe other areas may have had different rules on smog back then,Like California. Just my .02. Later:k5:
 
My 88 Federal smog blazer came with no cats from the factory. Just went thru smog testing 2 months ago and passed with flying colors without cats.
 
Muddytazz said:
My 88 Federal smog blazer came with no cats from the factory. Just went thru smog testing 2 months ago and passed with flying colors without cats.
Click to expand...

That is wierd cause my fed emissions 87 has a cat:thinking:

Dik
 
78GMCJIMMY said:
I believe 1978 was the last year for Blazer 4x4's with no Cats. I own a 1978 GMC jimmy,an original Arizona Truck w/ no cats, and no smog, Just PCV.I believe this is because 4x4's are"Off-Road Vehicles, and does not apply to 2wd's. I also believe other areas may have had different rules on smog back then,Like California. Just my .02. Later:k5:
Click to expand...

As I understood it, vehicles with a GVWR over 6000 didn't need cats until '79.

My '77 had a GVWR of 6200 and had no emmissions equipment on it.
 
jonathanjay743 said:
Thanks for all the replies.


The guy I bought it from put on a 3" Flowmaster exaust, it sounds killer. Does a cat rob any power?
Click to expand...

Not enough for you to tell any difference. The new cats are pretty free flowing so they do not do much in the way of hindering exhaust flow.

Dik
 
Old cats and mufflers are pretty restrictive.

Sometime in the 90's catalytic converter and muffler technology becamse a lot better and replacing/removing either didn't help much.
 
Put a 3" high flow cat on it, you won't notice any power difference and maybe a slight change in exhaust note.

You'll definitely need a cat to pass emissions in Utah, unless you know somebody.
 
Well depending on where in Utah you are. Since I live out in Tooele county I don't have to deal with the emissions, and I will not be adding the cat back onto mine. It is only required in four or five counties, but yes they started putting them on all of the Blazers in 79. In addition you may also need a AIR pump, EGR, and other emissions equipment to pass.

On the plus side it is nice to start seeing more Utah people post up.
 
I just want to echo the comment that its nice to see people here from Utah.:D


I bought my Blazer from a guy in Utah county & it passed safety & emmissions just last March their. I live in Salt Lake City so I'll figure out some way to do it. lectric80 any good wheelin in Toole? I always go to the "B" in Bountifull, but I live in Magna & Toole is really close. bigblock72 where do you go for wheelin?
 
bigblock72 said:
Put a 3" high flow cat on it, you won't notice any power difference and maybe a slight change in exhaust note.
Click to expand...
The cats quieted my exhaust down a lot.
 
jonathanjay743 said:
Thanks for all the replies.


The guy I bought it from put on a 3" Flowmaster exaust, it sounds killer. Does a cat rob any power?
Click to expand...

Get an older cat and gut it put it on your ride. Then you won't have any restrictions before your exhaust it will be all for looks.

Better yet move to a county that does not require smog! Like Mojave County!:D
 
I have used the 3" high flow cat, there is a slight difference in performance, but is almost unnoticable.

I only know it had some effect because it was on my wifes Z28 and the car picked up about 2/10 in the quarter mile.

But you have a 4x, don't worry none. Look them up in one of the mail orders and end your worries about it.
 
my '82 has a cat. i replaced it last year, actually.

Old cats and mufflers are pretty restrictive.

Sometime in the 90's catalytic converter and muffler technology becamse a lot better and replacing/removing either didn't help much.
Click to expand...

the old cats were big and full of pellets that packed in, got broken, melted or gunked up and really killed flow. the monolithics, like any new vehicle will have, are much freer flowing, smaller, and work better. having seen a few on flowbenches, they really don't hurt flow much at all. the po of my blazer gutted the old cat and the exhaust sounded all farty. when i put a new monolithic on there for emissions testing, the fart sound went away and i noticed absolutely no loss of power.
 
Blue85 said:
The cats quieted my exhaust down a lot.
Click to expand...

Not mine boy did they scream when I started the truck up :eek: boy did they run! I got the tail of one had fur under my hood too. :yikes:
 
You must log in or register to reply here.

Latest Posts

Top Bottom