I've got an original 67 RS w/ the 210hp 327 and the previous owner disconnected the A.I.R. system (smog pump) because it have a bad diverter valve. I think in fact the diverter valve is MIA. Anyone know anything about restoring these things?

Thanks in advance.

The diaphrams in those things rupture and they do not function after that. The failure puts the valve in the "on" position all the time so you may get afterfiring in the exhaust between gear changes. I doubt anyone is rebuilding them at this time but Don Dorfman has said he might do it some day. I would not hold my breath as it would be pretty difficult to tear that thing apart and put it back together without major surgery. You can install a dummy system for car shows if you like. I would not bother to have a functional system if I were in your shoes but that is just my opinion.

-Mark.

I'm not sure about 67, but in 68 only manual transission cars came with smog pumps. I've also been told that the dealer would remove them for you if you opted to do so. I'm not sure if that means the EPA didn't give a flip or what. I don't know if that buys you anything with the EPA in california. I guess it depends on if you're trying to pass an inpsection or restore a car to technically correct standards. If you're simply trying to pass an inpsection, get an assembly manual and start flipping UPC codes and other BS to see if they'll relent.

-dnult

The diverter valves were spec.d by engine and drivetrain type and were different for each application and through the years. Nearly all 1967 California standard and auto trans and most 68~69 Standard trans Calif cars had A.I.R., as did many "High Altitude" emissions cars sold in Colorado, Nevada and Utah, included A.I.R. systems originally, but many were removed by your 'friendly mechanic types' and still sneaked past smog inspection (if you knew someone like me). Dealers (and other shops) in California risked losing their smog certification if they were caught removing these systems. Even the CHP lost their certification for a year once because they tampered with Cop Car systems!
There are some general replacement valves available that work just fine for most applications and should be available through NAPA or other large auto parts houses. You can check some truck applications for H.P. type diverters as they used them on many small and big block applications also. The last but most expensive source would be to call one of the Camaro supply houses and get availability from them. Even if they only carry "the special Z-28" one - it will work.
I have an old A.C. Delco application list somewhere that I can look up your diverter code number if you need it. Let me know an I will go on the hunt for it.

I wasn't aware that california first gens had smog pumps on automatic cars. I was just going by what was in the assembly manual and presumed it was universally accurate. I didn't know California got into the smog business until the early 70's.

-dnult

dnult;

Yeah - all this 'what had what' can get real confusing, now that there are few matching number/code cars still around.
I was a licensed "smog guy" back-in-the-day and did lots of smogs at a So.Ca. dealership(s) on early models. I kept a couple handy code list to check engines.
The easiest way to spot an A.I.R. car (if it still had an original block in it) would be by the suffex for the engine code. A 49 state or non-High Altitude 1967 Camaro with the 210HP 327 would be a 'MA' code for a manual without A.I.R. and 'MB' for a manual with A.I.R. For a Powerglide equiped car the code was 'ME' for non-A.I.R. and 'MF' for A.I.R. equiped cars. I always checked the code for "out-of-state" cars with no A.I.R. before I signed off the certificate.
The 275HP 327 used codes 'MK' for non-A.I.R. and 'ML' for A.I.R. manual trans. The Powerglides used 'MM' for non-A.I.R. and 'MN' for the A.I.R. equiped cars.
A.I.R. equiped California cars had option codes K19 and K24 listed on their build sheets to indicate the A.I.R. system (and required 'closed crankcase vent') was installed. These may be in the assembly manual, but my copy is at the shop so I can't look it up.
I think all of these numbers, as well as the numbers for the 302 & 350 are on the CRG site - but I didn't go there to confirm - my bad.
Hope this helps - post back if I missed something.

John

BTW - California got into 'the smog business' in 1962!

Later GM cars have diverters too, but they bolt to the pump with two bolts instead of a hose nipple connection. One of those could be adapted to work if a hose nipple were pressed into the inlet port.
The 70's diverters had an outlet that went to a muffler, I don't think a hose would fit on there.

An 84 Chevy pickup has one that would work with an inlet conversion, the oultet hose goes to the air cleaner for quieter operation.

For those with a stuck valve, carefully inspect the valve inlet for pieces of carbon seal from the pump. They get blown into the valve and hang it up.
David