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08-16-2016, 09:53 AM
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#1 |
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Senior Member
 
Join Date: Aug 2015
Location: Dunbarton, NH
Posts: 281
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Another “What is that for?” question
As the exploration of what I purchased continues, I found a plumbing type of fitting on the rear of my SBC 327 that I don’t know anything about. Can anyone tell me what that is for? It is just behind/under the distributor. It is plugged off, and If I don’t need it, I would like to eliminate it if possible.
Thanks, Steve |
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08-16-2016, 09:59 AM
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#2 | |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,412
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Re: Another “What is that for?” question
Quote:
Looks like a vent or part of an emissions system to me.... LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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08-16-2016, 10:39 AM
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#3 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,553
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Re: Another “What is that for?” question
Road draft tube cap.
Used on the last 327's to hook an inline pcv to the carb. Like in this diagram. http://www.corvetteforum.com/forums/...pcv-valve.html |
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08-16-2016, 10:51 AM
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#4 |
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Registered User
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
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Re: Another “What is that for?” question
it's called a road draft tube.
The length and angle of the lower (this has been cut off) is designed to create a suction when the truck is moving.The suction pulls out the fumes and moisture from the engine crankcase. Was last used in 1967. Since the one in the pic has been cut and capped,it is useless.There's no pcv that I can see.Does it have a hose from the valve cover to the intake or carb? Mike. 
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08-16-2016, 10:56 AM
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#5 | |
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Senior Member
Join Date: Aug 2015
Location: Dunbarton, NH
Posts: 281
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Re: Another “What is that for?” question
Quote:
For reference, the numbers on the block decode to a 1966 GenI 5.3L 220HP 327. Thanks again! |
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08-16-2016, 11:02 AM
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#6 |
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Account Suspended
Join Date: Apr 2016
Location: Rancho Mirage, Ca.
Posts: 875
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Re: Another “What is that for?” question
2 X's Road draft tube **OLD SCHOOL BABY**
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08-16-2016, 11:02 AM
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#7 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Another “What is that for?” question
Does your intake manifold have a oil fill pipe in the front? Originally, in '66, I think the pcv was hooked into the oil fill tube and the fitting at the rear was the vent hooked to the air cleaner base.
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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08-16-2016, 03:10 PM
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#8 | |
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Senior Member
Join Date: Aug 2015
Location: Dunbarton, NH
Posts: 281
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Re: Another “What is that for?” question
Quote:
I connected the PVC valve to a port on the intake, and will explore further using that port in the back as part of the venting system. Thanks, Steve |
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08-16-2016, 03:18 PM
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#9 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Another “What is that for?” question
This is what my Corvette PCV looks like. The PCV is in the oil fill tube.
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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08-16-2016, 04:41 PM
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#10 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,327
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Re: Another “What is that for?” question
It looks like it is plugged off, it IS the connection for the PCV system, where crankcase gases are drawn from inside the engine, then go through the restriction in the PCV valve, then into engine to get combusted.....
Draft tube... 
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08-16-2016, 05:28 PM
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#11 | |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,412
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Re: Another “What is that for?” question
Quote:
I think the draft tube was bigger in diameter and went down behind the engine and vented to the atmosphere..... It attached to the same port but it was used on the earlier engines. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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08-16-2016, 07:41 PM
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#12 |
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Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,649
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Re: Another “What is that for?” question
That is interesting. So, I suppose these engines would normally have no holes in the valve covers at all, is that right?
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08-16-2016, 07:52 PM
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#13 | |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,553
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Re: Another “What is that for?” question
Quote:
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08-17-2016, 11:55 AM
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#14 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,327
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Re: Another “What is that for?” question
When all the small blocks went to the larger journal cranks in 68, that hole behind the distributor was no longer made into the block. The big oil fill tube in the intake was not used much longer after that. The PCV in 68 and up went into the valve cover. If you have a 68 and up with the oil fill tube in the intake, it will have a cap that is not a breather type of cap. Emissions were tightening fast back then, the factory was try to get more control over all the pollution issues...
There's some exceptions the the above info, but you generally never saw valve covers with no holes in them after 67. |
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