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Discussion Starter · #1 ·
Ok this might be a tough one...
Does anyone know when the dealer installed headers or if the car from the factory with headers did they just eliminate the stove pipe (heat riser) to the air cleaner snorkel on an automatic car or was it replaced with something else that worked with the headers...I would like to know if I should be replacing the heat riser or just not worrying about it. I would like it to be correct if possible.

Second question...sorry. anyone have a picture of the breather hose set up and the heat riser tube to a correct 1968 L48 (ss 350) automatic air cleaner? I have seen ONE picture of a correct L48 (black air cleaner chrome top) on line and it is head on and you cant see the connections on either side.

Thanks in advance for the help. :beers:
 

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Ok this might be a tough one...
Does anyone know when the dealer installed headers or if the car from the factory with headers did they just eliminate ...

Second question...sorry. anyone have a picture of the breather hose set up and the heat riser tube to a correct 1968 L48 (ss 350) automatic air cleaner?

Thanks in advance for the help. :beers:
Nope - not tough at all ;)
1st - NO 1968 (or any other year for that matter) 1st Gen. Camaro EVER 'left the factory with headers' :noway:
"If" ... the dealer installed them, there's no telling what/how or more important 'why' they would have bothered to try to re-install the "Thermac" intake air heat system, or even a 'closed' style air cleaner, for cold starting - it just would no longer have been desired or necessary ;)

2nd - Here is a 1968 SS350 w/Auto and "Thermac" air heating system ...
Land vehicle Vehicle Car Engine Auto part


Hope this helps
 

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Discussion Starter · #3 ·
John,
Thanks,
That is the photo I have ...unfortunately no side views so I cant see the heat riser or the valve cover to air cleaner hose connection on the passenger side.
As far as the air cleaner I do not want to get rid of my closed unit because it looks great...chrome lid and all. I have the open unit as well So I guess I can run either one depending on where I am going (show or just daily driving).
I am interested as to why you think the dealer would have ditched the closed unit on an SS car...would they have talked the owner into the open unit or was it a package deal when you had the headers put on. Your thoughts..
Thanks.
 

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...unfortunately no side views so I cant see the heat riser or the valve cover to air cleaner hose connection on the passenger side.


... I am interested as to why you think the dealer would have ditched the closed unit on an SS car...would they have talked the owner into the open unit or was it a package deal when you had the headers put on. Your thoughts..
Thanks.
Yeah, it tought to find the correct 1968 OEM systems that routed exhaust manifold heat to the 'Thermac' system :(
Lots of 'repoppers' do the 69 thing though ...
The original system had a shroud that attached to the exhaust manifold and the riser tube plugged into it and ran up to the air cleaner snout fitting.
Looked something like this (these are Olds 350 parts ;) ) -

The 'valve cover to air cleaner' system was a tube fitting into valve cover (pass. side) and then a short piece of tubing, then an "arrester" (spring loaded valve to prevent 'back-fire' flames from going to oil vapors in valve cover area - this was found to be unnecessary and removed by many ...), and then a short piece of tubing to connect to the air cleaner base fitting.

And now a little 'hint ...
I can never find this stuff on any vehicles in wrecking yards - EXCEPT ... pickups and light-trucks :thumbsup:
I know this sounds odd, but i seem to come across an amazing number of 68 and even later models trucks that are scrapped way latter on in their life that cars in my local wreckking/pick-a-part yards!
Their engine compartments are almost always bone stock and the original parts I need are usually there :cool:
Guess others just pass this area of the yards up - but it's my 1st place to explore on any visit :yes:


As to 'my thinks' about the why's a dealer wouldn't have reinstalled any of this stuff after doing a header install ...
Well, 1st ... dealers really didn't do very much of this unless they were a dealer that specialized in modifing or producing 'Performance' vehicles - and there really weren't a lot of those around ...
And if they did, they really weren't interested in making the vehicle continue to meet any polution control rules and regs. These were almost always sold as 'off-road' vehicles and the buyers used them in competition vs. buying for the street. Of course there are some glaring exceptions to that 'off-road' intentions and design from a few dealers - but once the Feds started to inforce the rules and regs on dealer modified vehicles the majority stopped producting them rather than make them meet the specifications for street registration.
If you look at the Dana/Baldwin type vehicles that got upgrades and engine replacements to 427's etc. you will see they did even try to re-install any factory systems that didn't relate to engine function or performance use - the 427 Dana's I saw in 67~68 had little dinky air air cleaners on them when delivered to the customer - because they 'knew' the customer was most likely gonna take them off and install a 'velocity stack' or some other air routing system to increase intake flow :p

As always - this is IJMHO's of course, and just based off my experiences in and with dealers 'back-in-the-day' ...
 

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Discussion Starter · #5 ·
John,
Thanks for the info. Good stuff. The valve cover to air cleaner sounds complicated.

I think I have found the parts I need...listed on corvette sites (no camaro site that I have seen list them) Here are links to what I think are the right parts.

https://www.paragoncorvette.com/p-349569-flame-arrestor.aspx
That one lists as 64-67 but it looks like the animal we are looking for doesn't it?

https://www.chicagocorvette.net/item.php?item=14521&rc=1918

https://www.chicagocorvette.net/item.php?item=14557&rc=1918

As far as the thermac system I think I will just not worry about the stove pipe and shroud or if I find one I might modify the shroud or make one to fit. I Like the idea of looking on trucks...Thanks
 

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The 'Arrestor' looks correct :thumbsup:
The others, not so much but ... a quick question?
Is you original system a factory 'closed' system? Or ... does your air cleaner have the 'filter' thingy in a square hole on the pass. side of the housing? If so - then those two linked pieces will work, (just not with the arrestor) and will be correct. GM took the arrestor out of the system towards the end of production year and, like the 1969's, used the square-plug filter area to connect to the valve cover hole via the parts in your links.

The original closed system used on 350's used the arrestor, so if your car is early and a closed system (which for some reason IIRC yours was) then the square hole in housing is plugged (with a plastic plug), another hole is punched into the air cleaner base - it's connected with the parts I discribed above and those correct parts are hard to come by and not repopped that I know of.
 

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Discussion Starter · #7 ·
"Is you original system a factory 'closed' system? Or ... does your air cleaner have the 'filter' thingy in a square hole on the pass. side of the housing?"

Yes my system is just like the picture you attached in the second reply.
The thing is I am missing:
CONNECTOR - vent pipe w/327-350 valve cover, RH to AC
and the rubber hose.
So If I understand you correctly the hose and the connector should work and the hose should connect to my filter thingy...LOL. I think it is called an air cleaner filter or air cleaner crankcase breather....
this thing...
http://cgi.ebay.com/ebaymotors/69-7...ategoryZ34198QQitemZ310297628741#ht_500wt_926

or this one...
http://www.rickscamaros.com/camaro-air-cleaner-crankcase-breather-element-1968-1969.html

I think the orig. were white or translucent or something weird.

Anyway that is great news.
 

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"Is you original system a factory 'closed' system? Or ... does your air cleaner have the 'filter' thingy in a square hole on the pass. side of the housing?"

Yes my system is just like the picture you attached in the second reply.
The thing is I am missing:
CONNECTOR - vent pipe w/327-350 valve cover, RH to AC
and the rubber hose.
So If I understand you correctly the hose and the connector should work and the hose should connect to my filter thingy...LOL. I think it is called an air cleaner filter or air cleaner crankcase breather....
this thing...
or this one...
http://www.rickscamaros.com/camaro-air-cleaner-crankcase-breather-element-1968-1969.html

I think the orig. were white or translucent or something weird.

Anyway that is great news.
That one ;)
The OEM 68~69 (early?) filters were a dark (black-ish) color plastic with a course mesh sythetic fiber 'filter' media - it was a dark-ish color also, kinda like a course "Scotch-Brite"-'y' material ...
I think the Corvette 'repoppers' sell the 'correct' type ... for their 67~68(69?) applications.
The over-the-counter AC/Delco replacements were that light plastic style in the late 60's/early 70's and they became the OEM used type @ then.
 
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