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Old 09-11-2010, 07:34 PM   #1
CWO4-USN
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What Connects Here

Can anyone tell me what connects to this outlet behind the distributor right beside the oil pressure line?
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Old 09-11-2010, 07:39 PM   #2
El Jay
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Re: What Connects Here

That thing have a PCV system?
I ask because that's where the old road draft tubes were (for venting the crankcase) before PCV systems came about.
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Old 09-11-2010, 07:48 PM   #3
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Re: What Connects Here

Rgr, it's a 283 in a 69 C-10. Have a pcv valve on the driver side valve cover, probably a add-on by the po. Would it hurt anything if I block it off?
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Old 09-11-2010, 07:59 PM   #4
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Re: What Connects Here

Hmmm. Now ya got me curious. I wonder if your engine is a transplant from an even older vehicle? PCV systems became standard equipment around '63, IIRC.
Any chance you can get the number off the block? It can be a bear to see since it's located on the top rear of the block, just forward of the bell housing.

If you have a PCV valve coming off one valve cover & a source of filtered air on the other, I don't think blocking that off would be a problem
Hopefully somebody else will jump in here.
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"Never kick a fresh turd on a hot day." Harry S. Truman

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Old 09-11-2010, 08:12 PM   #5
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Re: What Connects Here

Thanks El Jay. Will attempt to get the engine number. Appreciate the assistance.
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Old 09-11-2010, 08:17 PM   #6
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Re: What Connects Here

BTW:

You'll find this whole board is folks helping folks.
There are several thousands of years of knowledge & experience here.
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Old 09-11-2010, 08:42 PM   #7
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Re: What Connects Here

That is a block vent. My old 327 had one. It just had a length of hose connected to it that kind of layed down along the bellhousing and ended just below the tranny. Thats what I would do with it.
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Old 09-11-2010, 08:47 PM   #8
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Re: What Connects Here

Thanks gottrucks. I will do that vice blocking it off. Thanks to all of this site, I'm learning valuable tips, and your advice is much appreciated!!!
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Old 09-11-2010, 10:04 PM   #9
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Re: What Connects Here

I have a 283 in my 71 and I put a freeze plug into it to seal it off. I use the PCV in the valve cover and it works fine.

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Old 09-11-2010, 10:32 PM   #10
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Re: What Connects Here

That is the piece that they replaced the road draft tube with when they first started using pcv valves instead of draft tubes. If you have a Pcv in one cover and breather in the other you don't need it and can put a freeze plug in the hole. Don't throw it and the bolt away though as guys still hunt for those when they want to run the early blocks and valve covers without holes in them. Not worth a lot but you might help someone out along the way with it.
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Old 09-11-2010, 10:44 PM   #11
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Re: What Connects Here

As noted it is the crankcase vent found on pre 68 blocks that also had an oil fill tube in the front of the intake manifold. The valve covers were solid and had no holes for a pcv valve. A hose can be routed from the vent to the base of the carb or the intake manifold vacuum port behind the carb. If you have this set up with the oil fill tube, you should have a vented cap on the tube

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Old 09-11-2010, 11:55 PM   #12
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Re: What Connects Here

For those that are curious the road draft tube was a metal tube that ran down below the engine. The air moving under the vehicle created a pressure differential in the tube typically lower than the air moving past the tube end. Worked like a syphon drawing the vapors out of the motor. Air inlet on breather on intake. Didn't work to well while sitting still though. Modern pcv system cured that.
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