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Re: Pressure relief valve on door jamb
71 was the first year for the valve and one of the ways to determine year of your cab, there are others as well but will not go into that. They only use the valve in the driver's side and it should be flat under the valve. The valve also gets a thin rubber oring around it as well to help seal against the "b" pillar.
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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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