Do you have OEM CA emissions / smog equipment still in place?

[DeadheadNM]

Just curious who has CA emissions equipment still on their motor. I'm trying to reconstruct the missing system on my current Blazer build. My other blazer has its original equipment still intact.

Let's see some photos documenting the CA emissions systems.

[Steeveedee]

My truck has the Federal emissions package, so I can't take pictures to help you. However, if you need to see what was used, the Chassis Service Manual has pictures and schematic diagrams of the systems used, to help you. Someone here was gracious enough to scan in the entire manuals for a number of years; you should be able to find what you may need from those manuals.

[DeadheadNM]

Originally Posted by Steeveedee

My truck has the Federal emissions package, so I can't take pictures to help you. However, if you need to see what was used, the Chassis Service Manual has pictures and schematic diagrams of the systems used, to help you. Someone here was gracious enough to scan in the entire manuals for a number of years; you should be able to find what you may need from those manuals.

Thank you! The manual had an example from 68 - some brackets differed. I couldn't find a schematic for 72. It helps having the other blazer to reference. I'm curious how these systems differed over the years and for AC vs non-AC trucks and what problems if any others have with their systems. Granted many or most systems were probably tossed out long ago.

[davischevy]

I can take more if you need them. I guess I should have called and let you look at it early that morning when I came back through Albuquerque.

[davischevy]

BTW, mine has what sounds like an exhaust leak. I had new exhaust installed, but the noise is still there. Do you have any ideas.

[Coley]

Originally Posted by davischevy

BTW, mine has what sounds like an exhaust leak. I had new exhaust installed, but the noise is still there. Do you have any ideas.

Check the back of the emissions unit for a vacuum port.
It looks like the vacuum line from the (california/emissions) carb has been plugged (in your 1st pic) and I believe this normally runs to the emissions unit.

Coley

[DeadheadNM]

Slowly coming together on the blue blazer.

[DeadheadNM]

I've read the pump can seize over time and makes a racket but wouldn't suspect that would sound like an exhaust leak. If the diverter valve diaphragm fails it can produce a vacuum leak (read it can be cured by placing a BB in the signal hose to the valve) and continuously dump air into the exhaust manifolds that can cause back firing.

I found a guy who rebuilds divertor valves for the corvette crowd. Rock auto recently had a close out on some USA made reproduction diverter valves for like $10. These are plastic and the hose tubes oriented differently but I may use one until I can have the original unit rebuilt.

Next time Larry! Thanks for the pics!

[DeadheadNM]

Here's an AIR schematic for a small block - generic and not specific for a pickup though.

[DeadheadNM]

I've been able to scrounge some NOS pieces to rebuild the system in my Blazer.

[DeadheadNM]

....even a pump.

[DeadheadNM]

The emissions decal for CA emissions half tons in 72 made use of this LM decal (not reproduced to my knowledge).

[DeadheadNM]

Example pic of AIR brackets and AC brackets for SBC 1972

[toms68cst]

I have a complete AIR System on my 68 if you need any more info/pictures. As I recall, at least in 68 only the standard transmission - half tons had AIR systems. There were probably different rules in later years.

[tdangle]

Guess I am lucky. My 3/4 ton 1970 had no emission controls, outside of the spark and fuel calibrations. Good luck getting it all together, so many people removed all that stuff years ago.

[DeadheadNM]

Originally Posted by tdangle

Guess I am lucky. My 3/4 ton 1970 had no emission controls, outside of the spark and fuel calibrations. Good luck getting it all together, so many people removed all that stuff years ago.

Thanks. I've been able to scrounge the parts but need to have the diverter valve rebuilt.

No 3/4t trucks had AIR - I believe these were emissions exempt.

[Bigdav160]

Originally Posted by DeadheadNM

No 3/4t trucks had AIR - I believe these were emissions exempt.

Here's the tag from my '72 California 3/4 ton 4x4 Suburban. I have no reason to suspect the fender well has been replaced. The engine has been replaced along with the exhaust. PO installed headers/aluminum intake. No AIR brackets left.

[leddzepp]

Originally Posted by Bigdav160

Here's the tag from my '72 California 3/4 ton 4x4 Suburban. I have no reason to suspect the fender well has been replaced. The engine has been replaced along with the exhaust. PO installed headers/aluminum intake. No AIR brackets left.

A suburban is not considered a commercial vehicle like a truck is here. It would make sense that it would have AIR vs. a truck.

[Ed F]

Originally Posted by DeadheadNM

Thanks. I've been able to scrounge the parts but need to have the diverter valve rebuilt.

No 3/4t trucks had AIR - I believe these were emissions exempt.

I bought a ‘70 C-20 in January of 1970. It was a 307cu in and 3 speed manual trans. Not sure where it was built but I bought in Wheaton Illinois. It had the air pump on it. Was pretty common in those days to just take the belt off the pump. I accidentally hooked a radiator hose to the pump during a valve job... left a white smoke screen behind it like I was running moonshine. You don’t forget that experience.

[DeadheadNM]

Originally Posted by Bigdav160

The only sticker remnants, on the core support, that I can see are for the coolant warning.

Well I learned something new. Thanks for posting that's great info. Maybe one ton trucks were exempt? I'll post up an example pic of the non-CA 3/4t emission decal I mentioned.

Originally Posted by Ed F

I bought a ‘70 C-20 in January of 1970. It was a 307cu in and 3 speed manual trans. Not sure where it was built but I bought in Wheaton Illinois. It had the air pump on it. Was pretty common in those days to just take the belt off the pump. I accidentally hooked a radiator hose to the pump during a valve job... left a white smoke screen behind it like I was running moonshine. You don’t forget that experience.

I'd like to see more 3/4 t examples - good to know.

[DeadheadNM]

Originally Posted by toms68cst

I have a complete AIR System on my 68 if you need any more info/pictures. As I recall, at least in 68 only the standard transmission - half tons had AIR systems. There were probably different rules in later years.

I'm really curious about 68 actually because I've seen two half ton 4wd trucks both seemed to have AIR brackets but CA emissions not listed on the SPID. Did all standard tranny V8 trucks in 68 have AIR equipment?

[davischevy]

Originally Posted by DeadheadNM

I'm really curious about 68 actually because I've seen two half ton 4wd trucks both seemed to have AIR brackets but CA emissions not listed on the SPID. Did all standard tranny V8 trucks in 68 have AIR equipment?

I can't speak to the 1968 V8 trucks, but my dad bought a new 68 1/2 ton, six cylinder, TOT, and it had an emissions system. I don't know where the truck was built, but not likely in California.

He traded it in on a new 69, 350 engine, 350 automatic, and it did not have an emissions system.

[toms68cst]

Originally Posted by DeadheadNM

I'm really curious about 68 actually because I've seen two half ton 4wd trucks both seemed to have AIR brackets but CA emissions not listed on the SPID. Did all standard tranny V8 trucks in 68 have AIR equipment?

From what I've seen, The AIR Pump (In 68 anyway) was installed nationwide (Not just Calf) on 1/2 ton - manual transmission trucks. I don't think it made a difference if it was a 6 or V8. I think the automatics had heat risers. My truck has no smog option listed on the glovebox. I am pretty sure it was purchased in the midwest.

3/4 ton trucks and heavier seem to have had fewer smog control requirements in 68.

[57taskforce]

Looking good Pete!

[DeadheadNM]

Originally Posted by 57taskforce

Looking good Pete!

Thanks! Shoot me a text when possible - lost all my phone data