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