1969 Camaro Smog System Question
 

I have a 1969 Camaro SS350 with a factory 4sp. It has the exhaust manifolds with the smog holes, but they are plugged with bolts. I need the smog tubes and other parts. First, what is the proper finish of the tubes, black or natural color? Who sells the correct reproduced parts (pump, tubes, check valves, hoses, etc) in the proper finish? I found tubes at Classic Industries in black finish, but I am suspect on the finish as i thought they should be natural. Any information is much appreciated. Thanks

Re: 1969 Camaro Smog System Question
 

MacNeish sells the correct stuff.

Re: 1969 Camaro Smog System Question
 

------Bill Hodell is also a well known provider of all that is GM smog, and a great guy to deal with. He will build you a smog set-up to fit your particular needs, both monetarily and originality wise. Call 330-832-0871........Bill S

Re: 1969 Camaro Smog System Question
 

[ QUOTE ]
MacNeish sells the correct stuff.

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Jerry MacNeish also has a system that is 100% original looking, but the pump is a dummy and does not draw on the engine.

Re: 1969 Camaro Smog System Question
 

[ QUOTE ]
------Bill Hodell is also a well known provider of all that is GM smog, and a great guy to deal with. He will build you a smog set-up to fit your particular needs, both monetarily and originality wise. Call 330-832-0871........Bill S

[/ QUOTE ]

Bill Hodel specializes in smog restoration, and knows his stuff. One of the nicest guy I know, who will give you many options base on your pocketbook. https://www.yenko.net/ubbthreads/imag...iggthumpup.gif

Re: 1969 Camaro Smog System Question
 

I have many smog setus for 69 if intereted. Pm sent

Re: 1969 Camaro Smog System Question
 

I am looking for ORIGINAL (Very Good Condition) 1970 Left side LS-6/L-78 over the valve cover smog tube "tree" and the ORIGINAL Hose part # ?????

IMHO, many people incorrectly use the 1969 left side "hockey stick" around front of valve cover tube on 70' applications.

I feel that ALL 70' L-78 Camaros should have the over the valve cover style, and the assy manual shows it. I would like to learn when and if the 70 L-78/LS-6 Chevelles switched from one to another....and for that matter what of the L-78 Nova smog tube configuration throughout the model year run.

I have asked Hodel before and as I recall he didnt know himself. Is there conclusive survivor evidence to verify your thoughts ?????????

Thanks,

Re: 1969 Camaro Smog System Question
 

Chuck, You may be right, but my BB with A/C smog is also over the valve cover. I have hydraulic valves, so I seldom need to get into my valve covers. But when I do, I have to remove the smog hose and check valve.
You would need to do that every time you adjust the solid lifter valves. I wonder why GM would switch to the over cover one, when the front one would eliminate the need to disassemble the smog hose.

Re: 1969 Camaro Smog System Question
 

The BB front one,-Left one..aka "Hockey stick" design,Part 3940933,will not work on vehicles with Air Conditioning,as the compressor/bracket gets in the way.
They used they the later issued #3981061 "Over the center of Valve cover" design for that,and continued with it well into the 1970's.
The 1970 Chevelle Assembly manual calls out the Left side revision on 9/12/69,but I can tell you that it didn't happen on all Chevelle/Elco's that fast and at all 6 solid lifter plants at the same time.Chevrolet used up the earlier issued "Hockey stick" design up to around January of 1970.
This is my own opinion based on talking to original owners,seeing their vehicles,Chevrolet archival photos and Car magazines road test articles on these vehicles from back then.

Re: 1969 Camaro Smog System Question
 

Rick,
I know that's why they used the over valve cover one on A/C cars. My point was that if they used the A/C type one on a solid lifter car, they would need to remove the check valve every time they adjusted the valves. It doesn't make sense that GM would use the over cover unit when they had an alternative already in the parts bin that would not require disassembly to adjust the valves.

Re: 1969 Camaro Smog System Question
 

It was probably all about cost & simplicity to themselves.
Why make two design tubes,when one design would accommodate both,where as the earlier would not.As at that time,they were well in the planning/design stages of the 71-72 models,most likely seeing the writing on the wall with the mandatory implement of A.I.R being required on ALL vehicles in the upcoming years,which meant A/C equipped Hydra lifter BB too.
Add to that,I think they pretty much new 99.9% of all new car Hi-perf owners were going to pitch the entire A.I.R. system within one hour of taking delivery anyway,so it getting in the way of adjusting valves would become a moot point.

Re: 1969 Camaro Smog System Question
 

[ QUOTE ]
....Add to that,I think they pretty much new 99.9% of all new car Hi-perf owners were going to pitch the entire A.I.R. system within one hour of taking delivery anyway,so it getting in the way of adjusting valves would become a moot point.

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Rick,

That is exactly what I believe the rationale was for use
of only the over the valve cover tube design. Does anyone
remember seeing a SHP engine with the AIR system intact
back in the day? I sure don't.....

Taking off the SMOG system didn't cost anything. You
gained some HP! Weren't we all trying to squeak as much HP
out of these cars as we could?

And as you've observed, GM knew most SHP owners were removing
these systems to gain HP. So it was a https://www.yenko.net/ubbthreads/imag...mlins/wink.gif https://www.yenko.net/ubbthreads/imag...mlins/wink.gif

Steve

Re: 1969 Camaro Smog System Question
 

[ QUOTE ]
I am looking for ORIGINAL (Very Good Condition) 1970 Left side LS-6/L-78 over the valve cover smog tube "tree" and the ORIGINAL Hose part # ?????



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Had look on my original smog long hose part number is 3947138, short one did not see anything.

Re: 1969 Camaro Smog System Question
 

That's actually hose #3947158,and is for the LH "Hockey stick" designed tube.
The RH passenger side shorter hose is #3969908.

Re: 1969 Camaro Smog System Question
 

Sent you a PM 427King