rochester carb info

[Steve D.]

Hi, i have a 1970 454 manual with a rockchester carb and from what I can see it has the smog pump removed and also some of the vacumn hoses that run to and from the carb. If anyone can post some close up images of this area then I can start my search for correct parts to assist with judging marks. Also if anyone knows the best place to locate code correct exhaust manifolds with A.I,R holes and all the code correct smog pump parts. Thanks

[Joe L.]

Re: rockchester carb info

Hi, i have a 1970 454 manual with a rockchester carb and from what I can see it has the smog pump removed and also some of the vacumn hoses that run to and from the carb. If anyone can post some close up images of this area then I can start my search for correct parts to assist with judging marks. Also if anyone knows the best place to locate code correct exhaust manifolds with A.I,R holes and all the code correct smog pump parts. Thanks

Steve-------


No 1970 Corvette with 454 was ever originally equipped with AIR (i.e. "smog"). So, you're lucky; you don't need to be looking for any of the components of such a system.

The only 1970 (or 1971) Corvette that was originally equipped with AIR was the LT-1.

[Mike F.]

Re: rockchester carb info

Do you have the 1970 AIM and 70-72 TIMJG? They will help you quite a bit.

[Terry M.]

Re: rockchester carb info

Steve-------


No 1970 Corvette with 454 was ever originally equipped with AIR (i.e. "smog"). So, you're lucky; you don't need to be looking for any of the components of such a system.

The only 1970 (or 1971) Corvette that was originally equipped with AIR was the LT-1.

Don't forget the 1971 LS6 which was originally equipped with AIR

[Terry M.]

Re: rockchester carb info

Do you have the 1970 AIM and 70-72 TIMJG? They will help you quite a bit.

And in Steve's case Dobbin's 1968-1972 Vette Vues Fact Book will give him the visuals he wants. I believe it is available, along with the above referenced texts, from our sponsor the NCRS Store. Click on the tab at the top of the page.

[Steve D.]

Re: rockchester carb info

thanks for that information. when I got the car judged 18 months ago they deducted all my point for the lack of smog pump equipment which was fair enough so will pass this above information on to our chapter judges.Have ordered some books from NCRS which are on there way so that should help.

[Terry M.]

Re: rockchester carb info

thanks for that information. when I got the car judged 18 months ago they deducted all my point for the lack of smog pump equipment which was fair enough so will pass this above information on to our chapter judges.Have ordered some books from NCRS which are on there way so that should help.

We try to make that kind of information clear in the TIM&JG, and we also try to make it easy to follow. Sometimes that goal just isn't met for a wide variety of reasons, some of them out of control of the judging manual team. At some point, however, it is wise for an owner to have the TIM&JG and know which parts of it apply to his car. I am not trying to blame the victim here, but sometimes, especially at chapter meets, the judges are out of their element. I like to tell the story of a chapter meet I attended. After driving 500 miles I found the class I was judging was a 1969, a 1979, and a 1994. I had never seen the C4 TIM&JG prior to that day. The good news is that the car was very low miles, so there was a lot of "benefit of the doubt." I did what I had to do, but I assure you that owner did not get the kind of judging he deserved. In defense of those meet administrators they found themselves with few judges with the needed skills. This was that owner's first NCRS judging experience, and I hope I didn't turn him off.

[Joe L.]

Re: rockchester carb info

Don't forget the 1971 LS6 which was originally equipped with AIR

Terry-----


Yes, I parenthetically added 1971 without thinking it through. Plus, it was late when I posted and my brain was not fully in gear.

[Joe L.]

Re: rockchester carb info

thanks for that information. when I got the car judged 18 months ago they deducted all my point for the lack of smog pump equipment which was fair enough so will pass this above information on to our chapter judges.Have ordered some books from NCRS which are on there way so that should help.

Steve------


I can absolutely guarantee you that no 1970 Corvette except LT-1 was equipped with AIR ("smog pump"). So, you can be absolutely assured that the judges got it wrong on this point.

Some folks might "extrapolate" that since all 1969 Corvettes were originally equipped with AIR (and they were), that 1970 must be the same. It's not, though. For 1970 all engines except LT-1 used CCS (controlled combustion system) for exhaust emissions control. The same system was used for most 1968-69 Chevrolets with automatic transmission EXCEPT Corvette.

[David P.]

Re: rockchester carb info

Steve, since you mentioned exhaust manifolds... I believe early '70 LS5s up to 5000 or 6000 had driver side exhaust manifolds with plugged holes for AIR ports (though no other AIR hardware as already established). I have them on my driver side manifold but not on passenger side. They are correct casting code and believed to be original to the car, even though I think the TIM says this is the case only up to sequence # 5000. Mine is a #5864 March car.

[David P.]

Re: rockchester carb info

By the way, heck yeah we're lucky we don't have the headache of finding/refurbishing the AIR system! 1970 was a great year

[Joe L.]

Re: rockchester carb info

Steve, since you mentioned exhaust manifolds... I believe early '70 LS5s up to 5000 or 6000 had driver side exhaust manifolds with plugged holes for AIR ports (though no other AIR hardware as already established). I have them on my driver side manifold but not on passenger side. They are correct casting code and believed to be original to the car, even though I think the TIM says this is the case only up to sequence # 5000. Mine is a #5864 March car.

David------


Yes, it has been reported that some earlier 1970 with LS-5 did have AIR-type exhaust manifolds with plugged fittings. However, I believe that these were plugged with an internal, square drive pipe plug. These are uncommon in the thread size required. If yours have internal, hex drive or external square drive, that would make me suspicious that they're not original to the car.

[Terry M.]

Re: rockchester carb info

Terry-----


Yes, I parenthetically added 1971 without thinking it through. Plus, it was late when I posted and my brain was not fully in gear.

I tried to be nice Joe. I have been there and done that. We should make a T-shirt for it.

[Steve D.]

Re: rockchester carb info

thanks all, that means I can spend the money saved from not requiring the smog components on other items. The cars birth date is may 17th 1970 and has only just done 34.000 original miles and is a no hit unmolested vehicle that after 44 years only requires some cleaning of the chassis and engine bay and a body paint where the silver has fadded in the sun. I have looked at the exhaust manifolds and the casting dates are correct and they have no plugged holes for the A.I.R hoses. the car is numbers matching.

[Mike F.]

Re: rockchester carb info

thanks all, that means I can spend the money saved from not requiring the smog components on other items. The cars birth date is may 17th 1970 and has only just done 34.000 original miles and is a no hit unmolested vehicle that after 44 years only requires some cleaning of the chassis and engine bay and a body paint where the silver has fadded in the sun. I have looked at the exhaust manifolds and the casting dates are correct and they have no plugged holes for the A.I.R hoses. the car is numbers matching.

How about some pictures? My car is one day younger, May 18, 1970.