On the 1970 454 in the corner by the hood closure on the drivers side is there suppossed to be a sticker for the timing and idle speed info. there was no emissions on this car ever.
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Re: 1970 Engine Compartment ?
What is the approximate VIN on your 70? Mine didn't have an emissions sticker either when I got mine in in '91 but I cannot say that it "never" had one prior to that. Mine is a late July car.Tony -
Re: 1970 Engine Compartment ?
Yes there should be one on your 70 in the same location as you had on your previous 68. My 70 small block base engine came from the factory without the air injection system.Comment
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Re: 1970 Engine Compartment ?
Don and Jim -----
Your car definitely was originally built with an emissions control system. It didn't have the AIR system unless it was an LT-1, but it DID have an emissions control system. The system was called the "controlled combustion system" or CCS, for short. It utilized specific carburetor and distributor advance control configuration to constitute the emissions control system.
Carburetor adjustment and timing specs were critical to the performance of this system. ALL 1970 Corvettes originally had an emissions label and the following labels were used:
300 hp------GM #3989372----coded "CR"
350 hp------GM #3989369----coded "AX"
370 hp------GM #3989374----coded "CT"
390 hp------GM #3980210----coded "DQ"In Appreciation of John HinckleyComment
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Re: 1970 Engine Compartment ?
Tony it is vin 194370S412756 June 18 car it looks like there used to be one.Comment
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Thx Joe that is the sticker i got sent to me.
NMComment
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Re: 1970 Emissions label *TL*
There were a few more than that guys. The 1970-1972 TIM&JG lists a total of 10 different labels for 1970, and that is not likely a complete list.
TerryComment
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Re: 1970 Emissions label
Terry-----
The only other label that I can find that may have been used only for California-equipped 1970 Corvettes (i.e. with NA-9) is a label coded "CB". I believe that this was a secondary label rather than a primary label like the others that I mentioned.
If there were 10 or more emissions labels for 1970 Corvettes, then there were more than TWICE as many labels (and, consequently, emissions codes) as for any other year Corvette, including later years when more complex and varying emissions systems were used. I'd be interested in learning the emissions codes and part numbers for any other labels used in 1970 in addition to how the tune-up information varied from the information included on the labels that I mentioned in my previous post.In Appreciation of John HinckleyComment
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Addendum
Terry-----
I found one other possible emissions code for 1970. It's "CJ" and MAY have been used for LT-1 with "CTK" or "CTV" (ZR-1) engine codes. I can't confirm it, though.In Appreciation of John HinckleyComment
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Re: 1970 Emissions labels *TL*
Base DO 3980208 & CR 3989372
L46 DR 3980211 & AX 3989372
LT1/ZR1 CL 3989299 & CT 3989374
LS5 DP 3960209 & DQ 3980210 & AW 3989368 & AS 3989366
All of these are from cars, not based on prints or paperwork. The TIM&JG lists some of the features (timing differences, engine call out, etc.) of these labels and some potential serail number ranges. As I mentioned, I wouldn't be surprised to find others.
TerryComment
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Re: 1970 Emissions labels correction *TL*
AX 3989369 Sorry too much to type and too late at night.
TerryComment
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Re: 1970 Emissions labels
I can verify the CR was one, my original owner 70 350/300 turbo 400 was bought in TX. Can anyone recommend a safe cleaning agent, mine could use a cleaning due to 33 years of use.Comment
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Re: 1970 Emissions labels *TL*
Whatever you do Jim, don't rub it with anything. The ink will come right off the plastic. I would like to know what will clean it also.
TerryComment
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Re: 1970 Emissions labels
Terry-----
Well, this is all very interesting. As I always say, there's nothing better than empirical evidence. Plus, the emission codes and part numbers seem to all fit for a 1970 application. "When I get a chance", I'm going to research this more fully. It just amazes me that there would have been this many codes for the 1970 model year, especially considering that the 1970 model year only lasted for 7 months. It may have something to do with California versus non-California cars. However, I can't find any difference in tune-up specs for California versus non-California.
While there were 18 engine suffix codes for 1970, there were 26 codes for 1969, but only 3 emissions codes that I can find record of.
1970 may have been an "unstable" year as far as emissions goes, though, and this might have generated some changes in emissions codes.
I would be very interested to hear from folks with 1970 Corvettes with what they believe to be original emissions labels and especially folks with original California cars (identified by the presence or "vestiges" of the charcoal cannister EEC system).In Appreciation of John HinckleyComment
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Re: 1970 Emissions labels *TL*
I haven't looked in the 1968-69 TIM&JG for those emission codes, but in the last year I have turned up a 1968 code that was not listed in there, so I know there are multiples in at least 1968.
None of the codes I listed earlier relate to the California emissions regulations. There was a paper California "certification" label for the windshield (with code WA, pt. #329221), and the yellow NA9 label (CB pt. #3989361).
All of this information has been in the 1970-72 TIM&JG for 10 years.
TerryComment
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