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#26 |
Registered User
Join Date: Sep 2008
Location: Mobile, Al.
Posts: 687
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Re: I Dunno What It Is
Yes it does look like a fill cap but what kind of clearance do you have with the seat installed to fill it? If it back blow ed you'd have a mess in you're cab and if it vented it would smell oily, strange.
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#27 |
Registered User
Join Date: Apr 2007
Location: King City, Ontario, Canada
Posts: 974
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Re: I Dunno What It Is
OH BOY. rare factory option!!
1 of a kinda. that vent was originally hooked up to a large air filter, with a pump driven by the engine. it pumped freash air into the cab constantly, it was designed for the president of the time, for if he was in some sort of gas attack. that was his gas-attack-escape-vehicle. they made it a truck so that it blended in actually, i have no clue what it is..looks like a vent of some kind that needed to be vented,but couldn't have water go in. easiest way to tell if its a vent or cap is to pull it off and look..
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- Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men. Last edited by 69halfton; 02-25-2009 at 08:08 PM. |
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#28 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: I Dunno What It Is
Quote:
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#29 |
Registered User
Join Date: May 2007
Location: Buffalo MN
Posts: 606
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Re: I Dunno What It Is
maybe it was the fill cap for a full frame or boxed frame gas tank, i have seen a motorcycle where the frame was used as another gas tank, id say its probly nothing factory
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Trial and Error, its expensive but its a mistake i most likely wont make again 1971 chevy k10 custom deluxe http://67-72chevytrucks.com/vboard/s...d.php?t=341257 1968 chevy k/10 fleet http://67-72chevytrucks.com/vboard/s...d.php?t=334731 1948 desoto custom coupe fluid drive(family heirloom) |
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#30 |
Registered User
Join Date: May 2000
Location: Alexandria, LA 71301
Posts: 1,451
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Re: I Dunno What It Is
"Logic" says this is a fill tube, and i say "logic" because logically you don't vent into the passenger cab area. it most likely is a fill tube for a PTO that is/was mounted to a gearbox attached to the output shaft of the transmission. not positive on this application but i have seen this before for a PTO setup.
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-02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project |
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#31 |
Active Member
![]() Join Date: Feb 2009
Location: Cle Elum, Washington
Posts: 164
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Re: I Dunno What It Is
The larger trucks had vac brakes and a tank on the frame and the vent was in the
cab to keep dust and moisture out of the system. You could hear air moving if the truck was parked and you pushed the brake pedal. Retired rancher and owned one a GMC.
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cascadeheavychevy 67 C10 327 4speed 69 C20 350 4WD 4speed 69 C20 350 4WD 4speed 69 C20 350 4 soeed 69 C20 CST 350 Auto 70 C10 307 4speed 71 GMC Supr 350 Auto 70 C10 350 Auto 67 CST 327 Auto |
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#32 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: I Dunno What It Is
^I`m buyin`it! That makes sense to me.The last C/40-up brake system suggestion got me going before.i`ve only seen a couple of those 11,000#+ C/30s and just enough to notice the wheels.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#33 |
Registered User
Join Date: Mar 2008
Location: baltimore
Posts: 136
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Re: I Dunno What It Is
there is alot of space next to the gas tank ,, not what a stock gas tank looks like
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#34 |
Rods
![]() Join Date: Nov 2002
Location: Bryan, TX
Posts: 1,398
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Re: I Dunno What It Is
ok I looked at every page of the fsm.. I found it. It is a fresh air breather for hydraulic over vacuum brakes. another tube went from there to the passenger side where a vacuume pod was mounted. If i have time ill try to scan it for you.
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#35 |
Special Order
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Location: Mt Airy, MD
Posts: 85,858
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Re: I Dunno What It Is
Thanks 70 Suburban!I thought it looked factory.This was one special truck.I never saw too many of those beefed-up 1 tons and this one was a Custom Cab (bright mouldings at the glass) and had air conditioning.I`m going to check the SPID to see what else it had.I got it because it was the holy grail for a K/20,which I had three of,with high hump,a/c,and cab lights.
I removed the gas tank and cleaned it.It`s just set in there,not mounted. ![]()
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#36 | |
Registered User
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Location: Foster Rhode Island
Posts: 1,176
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Re: I Dunno What It Is
Quote:
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#37 |
Rods
![]() Join Date: Nov 2002
Location: Bryan, TX
Posts: 1,398
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Re: I Dunno What It Is
lol i was only conferming your original statment
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#38 |
Sisyphus was my mentor!
![]() Join Date: Sep 2002
Location: Carleton Place, Ontario CANADA
Posts: 984
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Re: I Dunno What It Is
It's a PCV valve - Positive Cab Ventilation!
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passthebuck ![]() #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car |
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#39 |
Registered User
Join Date: Sep 2008
Location: Lebanon, MO
Posts: 48
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Re: I Dunno What It Is
Its the HydraVac vent, the cab is from a 1 1/2 truck or so.
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#40 |
Registered User
![]() Join Date: Jul 2007
Location: SE WY
Posts: 640
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Re: I Dunno What It Is
Saw one on a 69 GMC 5500 truck today at an auction. It looked like it was for the brake booster used as a breather. The booster was mounted right below the cap on the frame and only the master cylinder was up under the hood. Tried to take pictures of it with cell phone but they didn't come out very good.
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72 chevy 3/4 ton 4X4 |
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#41 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: I Dunno What It Is
The PO ate Mexican everyday?
(Cab Vent) ![]()
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#42 | |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: I Dunno What It Is
Quote:
http://67-72chevytrucks.com/vboard/s...=318118&page=2
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#43 |
Resident of Here
Join Date: May 2008
Location: Wesley Chapel, FL, USA
Posts: 7,716
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Re: I Dunno What It Is
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~Bradley~ 2004 Black GTO LS2/T56 too much to list ![]() Miss having a truck ![]() |
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#44 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: I Dunno What It Is
And the booster. Pic from 71 c30 build.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#45 |
Special Order
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Location: Mt Airy, MD
Posts: 85,858
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Re: I Dunno What It Is
There goes my theory it was a special 1969 Woodstock Edition that came with a hippy camper built on it and this was the driver`s air supply from the back.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 03-03-2009 at 12:25 PM. |
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#46 | |
Registered User
Join Date: Feb 2009
Location: Bakersfield Ca.
Posts: 23
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Re: I Dunno What It Is
Quote:
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Shane Live life like there isn't going to be a tomorrow.....Because tomorrow doesn't exist! ![]() ![]() |
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#47 |
I'M TRUCK CRAZY!
Join Date: Oct 2006
Location: Sachse, TEXAS
Posts: 1,737
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Re: I Dunno What It Is
it is a kanewter valve. don't know how you would spell that.
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