i did a search and couldn't find the answer - what year did chevy first put emission controls on K5 blazer

ive seen it on 69-72 but in the 80's every thing had to smogged so it might have been swapped after.

i did a search and couldn't find the answer - what year did chevy first put emission controls on K5 blazerdepends on the state. I know cali cars and trucks were smogged before the rest of the nation.

What year truck do you have?

don't have one yet but am looking at a frame with a good title that my buddy has - and want to have a pre emission model so i don't have to deal with that crap when and if they start regulating it here - thanks for the replies

Cat converters came out in what....1975 (?) Before that if there was emissions they were pretty basic if at all. If they "begin" to institute testing I'm sure older stuff would/could be grandfathered....unlike other states where it's been part of the proceedure from a certain year to date.

California doesn't require any smog control or anything for 75 and before.
So here if you title say's 75 or earlier, do what ever the fawk you want.:D
That's why i got two 68,71 cj's and a 71 chevy truck.
What do mean by emission controls? My 68 cj originally had air in injection:confused:
So who knows how early you would have to go to have no form of emission controls. In California even if, say your 75 had emission controls, you could remove it. So if you are in California all 75 and prior blazers have no emission controls.:D

don't have one yet but am looking at a frame with a good title that my buddy has - and want to have a pre emission model so i don't have to deal with that crap when and if they start regulating it here - thanks for the replies

all thats there is the frame?

All depends on the year, motor, and if california emissions or fedreal emissions(which state did it come from). We need more info!

Every Blazer ever made had some kind of emission controls on it from the factory.

all thats there is the frame?
he bought it off another friend for motor and trans - tub is shot - i don't want rears - plan is to do a frame up - my brother lives in phoenix and a trip to see him and a junkyard tour to find a tub is in the plan - i figure get the frame sandblasted and powdercoated - put in rears motor trans and t cases - tires wheels etc then find body parts

Every Blazer ever made had some kind of emission controls on it from the factory.First correct answer in this thread.

First correct answer in this thread.

No kidding. What do you mean by emissions controls? PCV, a cat, and early EGR really are pretty passive devices. Heck, air injection really isn't anything more than one more pulley to wrap the belt around too. The only thing you really should concern yourself with is if it has a feedback carb and electronic spark control. Even if it does...a $200 Edelbrock 1406 and $50 eBay HEI dizzy would eliminate that.

So...are you looking from a legality standpoint as to how much you must have or simply what years came with what? Emissions controls are not nearly as scary as people make them out to be. Aside from the vacuum line and electronic nightmare that makes up the feedback and ESC models nothing is all that scary at all. One vacuum line to an EGR? Two hoses for the PCV and fresh air vent rather than breathers? A cat, possibly with air injection? All of it is pretty much just there and not a problem.

cat converter came out in the last half of 1975 production year. early models did not have them. i own a 75 k5 that didnt have one from the factory

guess converters where my biggest question and with the new high flows they have out thats probably really not much of a concern - just want to have the least amount of bs on motor and still be legal because i'm sure one day soon we'll have emission control testing here like many places and i've heard that in some states everything that came from factory has to be in place to pass even if motor runs "clean" on test- he's gonna give me title tomorrow so i'll let you guys know what year it is then - thanks for the info

Converters are nothing to be scared of. They are 100% passive. Converters fail for two reasons...rust which can be avoided by always allowing the exhaust to get warm enough to keep the water vapor suspended...and from overheating/breaking down/plugging which is due to a rich, poorly running engine.

Seriously...even after the converter fails to do its job of cleaning up emissions it still will not be a significant restriction in the exhaust. They fail when a bunch of raw gas gets dumped in them. They do their job by burning it up, but a rich or misfiring engine will keep dumping fuel in them until they go into meltdown. Converters don't generally fail on their own. You'd be amazed how much cleaner an engine with ONLY basic emissions such as a PCV system or cat can are compared to something running without any emissions. Since it is not going to change your performance noticeably to run without the cats I would strongly encourage you to run them if for no other reason than to keep the environazis at bay.

I asked a friend at an exhaust shop and he said converters were required by CA in 1975 and federally in 1979. Here in CO if it is 1979 or older he can legally remove the Cat if it has one. He brought up the same points as TE3006 and actually recommends cats over mufflers for many applications to get the right exhaust note. He told me that most people want the same deep tone and that it is easier, cheaper, and longer lasting to get that tone with a cat and a long resonator than it is with a name brand muffler.

-Dane