Did this K20 come factory with catalytic converter?

[ButchM]

Juke
The best answer to any questions asked about engine originality is "I was told the engine was been rebuilt" nothing more.
Butch

 

[ButchM]

Juke
Your truck is referred to in the GM parts manuals as an "03" body (2 door fleetside). The option label in your first photo shows it has the LT9 5.7L/350 engine and C6P heavy duty chassis.
Hope these help
Butch
This page from a 1991 GM parts manual shows the codes "K2" and "03" for the 2 door 4WD pickups.

You must be registered for see images attach

This page in the parts manual shows the K2/03/LT9/Calif emissions (3/4 ton, 2 door, original engine) has a single exhaust with no cat.

You must be registered for see images attach

Lighter duty trucks with the 305 or the LS9 350 did have the cat.

You must be registered for see images attach

The front page of the manual is below.

 

[Ricko1966]

And if you start arqueing technicalities,instead if just trying to make them happy,they are going to discover your truck isnt right. Once they discover your truck isn't right,then the real fun begins. If they are willing to pass it and ask no further questions,put some cheap cats on it and go away a winner. Going to another inspection station is just a gamble maybe they won't want cats,but might find 6 other things,1 being the wrong engine,that by the book,won't pass. Go in act stupid,say nothing and do what they ask, if it's piddly stuff. A pair of cheap cats is less than 150.00 I've paid more than that in late penalties many times. Here's another nitpick for you,you convince him it's a heavy duty emissions truck,no cat's required, then he looks at you and says well a heavy duty emissions truck has to have the correct air cleaner with emissions sticker intact. If you don't have it, good luck finding one cheaper than cats.

 

[ButchM]

Ricko is not off base with his recommendations. If you have a place that says you just need "this" (cats, or fill in the blank) to pass; you may be better off taking that route, assuming its not stupid expensive. If the guy wanted to be a butt it would all have to be near like it left the factory.... missing a sticker, sorry, you have to have it.... wrong type air cleaner, same... This thermo valve, that no one has in stock or no longer produced, is not working and needs replaced etc, etc, etc. You could win a battle and lose the war. Some/ many places will look that it all "appears" to be correct, in place with no obvious damage (hence, wanting to have cats) run the sniff test, if its below limits, you are golden.

Also, contrary to what some have said, if they know where to look closely and are knowledgeable, a 305 has a few observable differences from a 350, casting marks on the ends of the heads, harmonic balancer are quick checks with a flashlight and mirror. Often the engine code on the right front block pad and casting numbers at the block left rear are quick checks in a full size truck.

This leads back to if you have a shop that says (in writing) that you need "this" to pass. I'd be for making them happy and getting the smog slip.
You may also be dealing with a guy that would be happy to have the correct information and be willing to work with you.
Going stock would also require putting a single exhaust system on the truck. Only you can determine the best course and it would likely depend HUGELY on how you present it to him.
G'luck
Butch

 

[Fitz]

Your glove compartment label shows the C6P Heavy Duty Emissions designation. The door label shows the GVWR at 8600. That is the none Cat equipped identifiers from G.M. However, the thing that DOES make your truck REQUIRE Cats is the California Emission code of YF5. California required Cats beginning in 1973 on all pickup trucks. If registered in Oklahoma, where I live. Your truck would not require Cats. Due to the GVWR of 8600 being registered in Oklahoma, not in California.

 

[Keith Seymore]

However, the thing that DOES make your truck REQUIRE Cats is the California Emission code of YF5. California required Cats beginning in 1973 on all pickup trucks.

This is not correct.

Link to Heritage Center Doc:

Site Maintenance

Refer to the attachment referenced a couple times earlier in the thread which show no cats, even for California emissions, regardless of where registered. (pg 39 of 188)

K

You must be registered for see images attach

 

[Grit dog]

Not sure why the antagonism for a “few” old trucks that either don’t require or could easily be a model of a few years different vintage that don’t require ______ (fill in the blank for which piece of emissions equipment being discussed).
Even the govt has stopped caring about what comes out the tailpipe of these and other relics, in the vast majority of locations….
Heck if anyone who’s dyed in the wool must maintain emissions position really was interested in saving the planet, they would only be driving their squarebody to the wrecking yard to be put out of service and driving something from this century at least that burns less fuel and emits less emissions than any run of the mill squarebody, even on its best day.

 

[84GMCSierra]

Juke
Your truck is referred to in the GM parts manuals as an "03" body (2 door fleetside). The option label in your first photo shows it has the LT9 5.7L/350 engine and C6P heavy duty chassis.
Hope these help
Butch
This page from a 1991 GM parts manual shows the codes "K2" and "03" for the 2 door 4WD pickups.

You must be registered for see images attach

This page in the parts manual shows the K2/03/LT9/Calif emissions (3/4 ton, 2 door, original engine) has a single exhaust with no cat.

You must be registered for see images attach

Lighter duty trucks with the 305 or the LS9 350 did have the cat.

You must be registered for see images attach

The front page of the manual is below.

Is there charts like these for my 84 Sierra C2500, C6P? 350/TH400 base model with California Emission. I need to know what to put back on to move to Tucson, Az. I'm having an older 350 put in it as the crate that was in it hydrolocked. Thanks everyone

 

[DoubleDingo]

Not sure why the antagonism for a “few” old trucks that either don’t require or could easily be a model of a few years different vintage that don’t require ______ (fill in the blank for which piece of emissions equipment being discussed).
Even the govt has stopped caring about what comes out the tailpipe of these and other relics, in the vast majority of locations….
Heck if anyone who’s dyed in the wool must maintain emissions position really was interested in saving the planet, they would only be driving their squarebody to the wrecking yard to be put out of service and driving something from this century at least that burns less fuel and emits less emissions than any run of the mill squarebody, even on its best day.

It would be nice if the more strict states adjusted the year requirement, but they probably won't. It was nice when it was a hard 25 years back, you knew your vehicle would eventually be free from the bs. But, and a BIG BUT at that, and the idiotic "officials" decided, at least in CA, not sure about other states, yet in Califuckya 75 became the year.

Not sure the validity, but I've heard rumblings of 1995 being the new cutoff because there are so few older vehicles on the road that need testing. Curious if that actually comes to fruition.

 

[Ricko1966]

Not sure why the antagonism for a “few” old trucks that either don’t require or could easily be a model of a few years different vintage that don’t require ______ (fill in the blank for which piece of emissions equipment being discussed).
Even the govt has stopped caring about what comes out the tailpipe of these and other relics, in the vast majority of locations….
Heck if anyone who’s dyed in the wool must maintain emissions position really was interested in saving the planet, they would only be driving their squarebody to the wrecking yard to be put out of service and driving something from this century at least that burns less fuel and emits less emissions than any run of the mill squarebody, even on its best day.

That's the problem the new crowd wants all our old cars driven to the junk yard and everyone driving EVs. Waiting for the next round of cash for clunkers to pushup EV sales.

 

[ButchM]

Is there charts like these for my 84 Sierra C2500, C6P? 350/TH400 base model with California Emission. I need to know what to put back on to move to Tucson, Az. I'm having an older 350 put in it as the crate that was in it hydrolocked. Thanks everyone

Paul
Are you wanting the exhaust system diagram from the parts manual like I sent for Juke, for your 84? If so, which engine does yours have LT9,LS9? The engine code will be on the sticker in the glove box.
Butch

 

[AuroraGirl]

I feel like were are missing a really big easy slam dunk here.

The emissions asshole says you need a Cat

REFER HIM TO YOUR VECI LABEL on your engine air air cleaner (you have it , right)
If you dont, I think @ButchM book has the listings and you can have it replicated or the thread on them has it. The VECI will clearly lay out HD emissions and the adjustments and the vacuum lines etc
There will be no heat shields under the truck
And you may not even have evaporative emissions compliance depending on what the VECI says

 

[Grit dog]

I feel like were are missing a really big easy slam dunk here.

The emissions asshole says you need a Cat

REFER HIM TO YOUR VECI LABEL on your engine air air cleaner (you have it , right)
If you dont, I think @ButchM book has the listings and you can have it replicated or the thread on them has it. The VECI will clearly lay out HD emissions and the adjustments and the vacuum lines etc
There will be no heat shields under the truck
And you may not even have evaporative emissions compliance depending on what the VECI says

My no cat 86 C6P has like 3 different factory heat shields underneath.
And the OP doesn’t have the sticker. He qualified that in the first post. And they all have evap.

 

[Grit dog]

That's the problem the new crowd wants all our old cars driven to the junk yard and everyone driving EVs. Waiting for the next round of cash for clunkers to pushup EV sales.

Fortunately cash for clunkers hasn’t been an issue since 2009.
Year over year, state emissions testing has been reduced or stayed the same. Not certain any state has made tougher emissions testing requirements in a long time.
EV sales and EV initiatives and production are leveling off, EV incentives are getting lower or more restrictive.
My post and this discussion have little to no bearing over “classic” vehicle policy. My point was simply to identify the Facebook-esque responses.

 

[ButchM]

My no cat 86 C6P has like 3 different factory heat shields underneath.
And the OP doesn’t have the sticker. He qualified that in the first post. And they all have evap.

He said the under hood sticker was missing. I was asking about the Service Parts Identification sticker/label that should be on the inside of the glovebox door. I will list the engine code (LT9,LS9,LE8 etc).