Curious findings while researching my 1970 Coupe
05-20-2004, 03:28 PM
#1
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Curious findings while researching my 1970 Coupe
My 1970 has no indication it ever had AIR equipment on it. No smog pump, no fittings on the exhaust manifold, nada.
However, the other night I pulled the carburetor off to do a little tweaking. The part number on it is 70 40 5 02
According to some documentation I found on this here internet:
The 70 is for pre-1975 Rochester
The 40 is for 1970
The 5 indicates California or High-Altitude
The 0 indicates Chevrolet
The 2 (even number) indicates Automatic Tranny
Furthermore, this jets in the carb ar marked 75 and the primary metering rods are marked 45B
Any one you historians know if California cars would have "not" been equipped with AIR?
However, the other night I pulled the carburetor off to do a little tweaking. The part number on it is 70 40 5 02
According to some documentation I found on this here internet:
The 70 is for pre-1975 Rochester
The 40 is for 1970
The 5 indicates California or High-Altitude
The 0 indicates Chevrolet
The 2 (even number) indicates Automatic Tranny
Furthermore, this jets in the carb ar marked 75 and the primary metering rods are marked 45B
Any one you historians know if California cars would have "not" been equipped with AIR?
05-20-2004, 03:35 PM
#3
Race Director
Re: Curious findings while researching my 1970 Coupe (Budizzo)
I have a base car and mine had no smog pump or provisions for an air pump either.
05-20-2004, 03:37 PM
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Re: Curious findings while researching my 1970 Coupe (SteelCitiesLT1)
Thanks, I did not know that..
Interstingly enough, I bought this car in Georgia...a long way from California.
Interstingly enough, I bought this car in Georgia...a long way from California.
05-21-2004, 12:26 PM
#6
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Re: Curious findings while researching my 1970 Coupe (LAvetteman)
As SteelCitiesLT1 said, no pump except for LT-1, however, non A.I.R (pump)engines did have some smog equipment.
It was TCS (Transmission Controlled Spark). There was no vacuum advance until the transmission was shifted into a higher gear.
Barry
It was TCS (Transmission Controlled Spark). There was no vacuum advance until the transmission was shifted into a higher gear.
Barry
05-21-2004, 12:35 PM
#7
Melting Slicks
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CI 5 & 8 Veteran
Re: Curious findings while researching my 1970 Coupe (Barry's70LT1)
As SteelCitiesLT1 said, no pump except for LT-1, however, non A.I.R (pump)engines did have some smog equipment.
It was TCS (Transmission Controlled Spark). There was no vacuum advance until the transmission was shifted into a higher gear.
Barry
It was TCS (Transmission Controlled Spark). There was no vacuum advance until the transmission was shifted into a higher gear.
Barry
:iagree: How long do you think the TCS valves lasted on those old cars? I my case, I have a couple of them laying around in a can somewhere in my garage!! :auto: :auto: :steering:
Bullshark
05-21-2004, 04:56 PM
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Re: Curious findings while researching my 1970 Coupe (Bullshark)
How long do you think the TCS valves lasted on those old cars?
Bullshark
Bullshark
They were the first to go.