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01-13-2011, 02:00 AM
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#1 |
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Registered User
Join Date: Aug 2009
Location: Simi Valley, CA
Posts: 193
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Door relief valve
I just put new seals all around in my '67 C20 and now it is really hard to close the door unless the window is cracked!
Is it possible to retrofit a relief valve from the later model to my cab? What would be involved in that? Where does the air go? TIA |
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01-13-2011, 02:18 AM
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#2 |
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Registered User
Join Date: Mar 2010
Location: Red Bud, IL (Home) Newton, IL (Shop)
Posts: 301
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Re: Door relief valve
I'm going to start off by saying I'm jealous that you have your cab that well sealed. How about cracking the cowl vents just a little? Anyway, I don't see why you couldn't install the valves from a newer truck, just have to cut the right size hole and screw it in.
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01-13-2011, 11:02 AM
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#3 |
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Registered User
Join Date: Jul 2001
Location: North Louisiana
Posts: 4,501
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Re: Door relief valve
There's no reason that it couldn't be done, but you could also install one from a '72 in the door jamb. '72s had a black plastic vent just below the driver's door striker in the cab.
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Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com Last edited by HuggerCST; 01-13-2011 at 11:25 AM. |
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01-13-2011, 12:04 PM
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#4 |
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Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,080
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Re: Door relief valve
71 and 72 had the vent. It was one of the changes they made in 71 to the cab, the others included the square hole for throttleand the raised pad for hanging rear view mirror (1 year only). You can get a used vent from one of these trucks, trace the outline of the backside and using a cut-off wheel cut the outline out, shape up with a square file and you have a cab vent. Be sure to use tape and tape off the areas around the cut so sparks dont screw up your paint. Hope this helps.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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01-13-2011, 01:16 PM
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#5 |
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Registered User
Join Date: Aug 2009
Location: Simi Valley, CA
Posts: 193
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Re: Door relief valve
So does the air come from the inside of the cab, through the valve, and into the space between the door and the jam? I'm just trying to figure out how it works.
Thanks for the responses! |
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01-13-2011, 01:29 PM
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#6 |
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Registered User
Join Date: Jul 2001
Location: North Louisiana
Posts: 4,501
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Re: Door relief valve
Yep, you got it!
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Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com |
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