Smog question on 1970
Thread Starter
Instructor
Joined: Jan 2002
Posts: 191
Likes: 0
From: Commerce Twp. Michigan
Smog question on 1970
Were all cars built in 1970 equiped with a smog system? Or could a car that was built for shipment to a specific state that did not have smog requirements be built without it.
I am looking at a documented 2 owner car out of a midwestern state that does not have smog, nor does it have exhaust manifolds that were prepped for smog. I failed to check the casting numbers. The second owner has had the car since the mid 80's and claims he never changed them. They appear to have been painted at some point but he has only put 5k miles on it in 20 years.
Comments, input??
I am looking at a documented 2 owner car out of a midwestern state that does not have smog, nor does it have exhaust manifolds that were prepped for smog. I failed to check the casting numbers. The second owner has had the car since the mid 80's and claims he never changed them. They appear to have been painted at some point but he has only put 5k miles on it in 20 years.
Comments, input??
Instructor
Joined: Aug 2002
Posts: 197
Likes: 22
From: Upstate SC
My 70 L46 is an early one and never had a smog pump. For more specific info look in Vette Vues Fact Book 1968-1972. It says that the 350 HP L46 and the base 300 HP had no A.I.R. equipment. The LT1 did.
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
Some smog stuff was optional on the big blocks.
There were different gas tank configurations -
My 70 BB is original except for the induction.... no smog pump, no fittings or threads/bungs on the exhaust manifolds.
There were different gas tank configurations -
My 70 BB is original except for the induction.... no smog pump, no fittings or threads/bungs on the exhaust manifolds.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
All C3s had smog equipment- Federal law & Calif. Not all had the air pump.
See Admissions by EPA - What emission standards before 80
http://forums.corvetteforum.com/showthread.php?t=213813
See Admissions by EPA - What emission standards before 80
http://forums.corvetteforum.com/showthread.php?t=213813
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
Originally Posted by mac383
Were all cars built in 1970 equiped with a smog system? Or could a car that was built for shipment to a specific state that did not have smog requirements be built without it.
I am looking at a documented 2 owner car out of a midwestern state that does not have smog, nor does it have exhaust manifolds that were prepped for smog. I failed to check the casting numbers. The second owner has had the car since the mid 80's and claims he never changed them. They appear to have been painted at some point but he has only put 5k miles on it in 20 years.
Comments, input??
I am looking at a documented 2 owner car out of a midwestern state that does not have smog, nor does it have exhaust manifolds that were prepped for smog. I failed to check the casting numbers. The second owner has had the car since the mid 80's and claims he never changed them. They appear to have been painted at some point but he has only put 5k miles on it in 20 years.
Comments, input??
Now having said that...if the car was headed for California...it was ordered with NA9 or evaporative control system...the charcoal canister with hoses and valves to control fuel vapor emissions.
That was it for 1970
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 2
From: New Zealand
Originally Posted by hunt4cleanair
....if the car was headed for California...it was ordered with NA9 or evaporative control system...the charcoal canister with hoses and valves to control fuel vapor emissions.
That was it for 1970
That was it for 1970
Le Mans Master
Joined: Sep 2002
Posts: 5,236
Likes: 898
From: Myrtle Beach SC
Originally Posted by standup
Are you saying that not all '70 Vettes have the charcoal cannister????? If so, what about '71?????? Just curious because it might mean my Vette was originally a California car............
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Intermediate
Joined: Dec 2001
Posts: 44
Likes: 3
From: Bay City MI
As Hunt4cleanair stated only the LT1 were stock with air pumps. I believe there was only one casting for the right and one for the left exhaust manifolds. The boss was drilled out for the engines equiped with air pumps.
