Did some 71s come with smog pumps while others didn’t? Looks like there wasn’t one on mine. Or did someone remove it. There isn’t a trace.

 

RE: Which C3s had smog pumps?

From fellow member Jim Shea:

This C2/C3/C4 listing should help.

A.I.R. PUMP USAGE (C2, C3, & C4)

Here is a listing that was posted on the NCRS Forum by Joe Lucia....

1966 CA-delivered Corvettes, except for the L-72, used the A.I.R. (RPO K-19) system

1967 CA-delivered Corvettes, used the A.I.R. (RPO K-19) system.

1968 & 1969, ALL Corvettes used the A.I.R. system regardless of engine, transmission, or where delivered.

1970, Chevrolet went to the CCS (Controlled Combustion System) for emissions control on most Corvettes, except the LT-1s.

1971, Corvettes continued to use CCS (except LT-1s and LS-6s).

1972, A.I.R. system returned for most Corvettes except engines except L48s with the "CKW" and "CKX" code.

1973 - 1975, all Corvettes used A.I.R, except for the 1974 L48 with automatic and Federal emissions which used CCS.

1976, all Corvettes returned to CCS, except California-certified cars which used A.I.R.

1977, all Corvettes used CCS, except California and "High Altitude" delivered cars which used A.I.R.

1978 & 1979 all Corvettes used CCS, except California cars, "high altitude" and all L-82s which used A.I.R. L-82s were not available in California or "high altitude" areas during these years.

1980 - 1987, all Corvettes used A.I.R.

1988 - on, A.I.R. was used on most, if not all Corvettes, although many C4s use an electric air pump.

 

No Trace? Even in the Ram's horn manifold? Look for 4 NPT type plugs on either side. Otherwise the prior owner got some Rams Horns over the counter for 'off-road'.

Unkahal.

 

If you have a 1971 LT1 or an LS6, then yes, it came with a smog pump.
If you don't, then yours didn't come with a smog pump.

LT1


LS6

 

A '71 LT-1 I bought earlier this year had no trace of the smog system including the rams horns having been changed. Looking through the years of receipts for works carried out, I'm pretty sure one of the previous owners was duped out of all the goodies on this particular car. The original carb, fast idle solenoid and mounting bracket, choke and of course smog were all gone. I do have photo's of back in the day when it was all present and as Green 454 post proves it was on the car originally.

I managed (with Forum help) to source all date correct parts which are all fitted now but it was a costly exercise especially with freight & import duty on top of the cost.

It'll be interesting to see what the OP's car was and if it was equipped with smog or not..

 

Dear Brit Vet. Ta! I ended up going to Manchester Poly under Victor Papanek for a while....small Corvette world!

I feel your pain somewhat.

I've had the 69 L-46 for 42 years.....I was a kid (with good taste!). Day One I removed all the smog stuff as the State I was in did not require it. I did a bang up job hiding it all. Except the NPT's in the Rams Horns...and they remain.

I boxed all this stuff up and carefully labeled it SMOG C-3. and stored it in my Parents garage.

10 years later I went into the garage...gone..."Hey Mom do you know what happened to XYZ box"? "Yeah, Your Dad threw it out 5 years ago...he said it was JUNK."

Sigh. I'm not an NCRS guy, so I'm not stressed.

Occasionally I see the whole set up on Craigslist etc. for $250 or so.....NEXT TIME I'm going to grab it.....It's worth many times that.

I have the same set up on the 82....every time I open the hood.....UGH!

Unkahal

.

 

Small world indeed!

at $250 a set I'd snag as many as I could

 

Not necessarily. If it was a base-motor small block, it never had smog manifolds.

 

The original poster 71Convertible did not answer the question "WHAT ENGINE do you have"....so this whole thread is MOOT!

unkahal

 

The "base engine" cars did not require the smog pump, as testing showed them to meet the EPA requirements without one. All the other engines needed to smog pump to pass EPA tests. (early 70's cars)

 

I googled CCS and got Carbon Capture and Storage. For electric generating plants. What is it in relation to car emissions?

 

CCS in 1971 Corvette speak is Controlled Combustion System, as explained on page 50 in the '71 owners manual.