#1  
Old 07-09-2020, 05:17 PM
unruhjonny's Avatar
unruhjonny unruhjonny is offline
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Default correct 1970 Formula v/c breather tube

I am wondering if anyone can tell me what details to look for on the most correct as possible rh valve cover vent tube for a 1970 Formula with the base engine.

I would guess that this tube is the same as the one for at least the early 1971 Formula's with the 400, 455, or 455HO (w/o the functional hood option).
I suspect it would be the same one used for 1972 Formula 400's, but am clueless about any interchange there after.

I have three at the moment, and have a good idea which one I think is most correct, but would appreciate pointers before I give my one spare to my brother for his '74 GTO.
(I want one for my car's correct engine, and one for my '72 WS 400 which is complete from the air cleaner to the oil pan.)


(this is neither my car, or my engine, but the correct breather tube is in place)

Thank you very much for offering any pointers ect.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #2  
Old 07-09-2020, 11:02 PM
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Formulabruce Formulabruce is offline
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The tube has a slight indented area on each bend that lasts for a couple inches where it was mandrel bent.
Here is a very original, on a base 400. Not sure what else you could want..
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  #3  
Old 07-10-2020, 06:36 PM
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unruhjonny unruhjonny is offline
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ok.

Thank you for offering a reply!

Well I was a bit vague to begin with, because I didn't know how much variation exists in these parts.

Here are the three I have:




The one I believe to be most correct it the bottom one in those two pictures, as it's the only one with an angled cut on the bottom... but this is just a guess.
My guess is because I seem to recall only seeing breather tubes with an angled bottom cut on older vehicles.

I also noticed that there is a bit of a pronounced ridge on this piece - something I guessed happened when it was manufactured, and wouldn't be totally out of the ordinary.



I will have to guess by your response that there is not much variation in these pieces from a correctness standpoint.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #4  
Old 07-10-2020, 09:01 PM
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Formulabruce Formulabruce is offline
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The correct one has a slant cut at bottom. Would be your bottom one in both your pics. The others are a bit newer IMHO .
That is my learned opinion based on my experience pulling them out.

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  #5  
Old 07-10-2020, 10:09 PM
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Held for Ransom Held for Ransom is offline
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I'm saying the opposite. Slant started in '73, straight cut before that.


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Old 07-10-2020, 11:42 PM
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unruhjonny unruhjonny is offline
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uh oh.

@ HFR that's a great picture!!

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
  #7  
Old 07-11-2020, 02:14 AM
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Formulabruce Formulabruce is offline
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Ya know, this could be right. I would need to get down to Marlboro and see a all original car in tact to be sure.
..

  #8  
Old 07-11-2020, 03:32 PM
Tellyshavilli Tellyshavilli is offline
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Quote:
Originally Posted by unruhjonny View Post
I am wondering if anyone can tell me what details to look for on the most correct as possible rh valve cover vent tube for a 1970 Formula with the base engine.

I would guess that this tube is the same as the one for at least the early 1971 Formula's with the 400, 455, or 455HO (w/o the functional hood option).
I suspect it would be the same one used for 1972 Formula 400's, but am clueless about any interchange there after.

I have three at the moment, and have a good idea which one I think is most correct, but would appreciate pointers before I give my one spare to my brother for his '74 GTO.
(I want one for my car's correct engine, and one for my '72 WS 400 which is complete from the air cleaner to the oil pan.)



(this is neither my car, or my engine, but the correct breather tube is in place)

Thank you very much for offering any pointers ect.
The vc tube opening in air cleaner moved about 1” further from snorkel in 1971 formula and TA (Except some very early 71cars )

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