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#1 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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What is this?
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#2 |
Senior Member
Join Date: Jul 2004
Location: Round Rock, Texas
Posts: 858
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Re: What is this?
What ever you do, don't stick anything in it! j/k
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Hook'em |
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#3 |
Registered User
![]() Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Re: What is this?
It's obviously a # 2 pencil holder
![]() no but seriously...I don't know...looking forward to finding out
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1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559 |
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#4 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
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#5 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
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#6 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: What is this?
does your truck have smog? maybe it has something to do with that but i dont think it filters out lead!!
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1967custom |
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#7 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
If by smog you mean evap then yes it did but it didn't connect there, I have it unhooked now and it's basically just a vent for my gas tank. I dunno what smog is.
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#8 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
Every Rochester 1bbl I've seen has them. Here's a pic of a 74 with a little tube in it
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#9 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: What is this?
Looks like a PVC port. Is the hole blind (dead ended), or does it lead into the throttle body? Is it pulling any vacuum when engine is running?
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#10 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
Yea it's dead ended. Does look like a PVC port but it's not, those are in a different spot on these models but good guess. I'm wondering if maybe it has something to do with a smog pump as he stated earlier. I do not have a smog pump.
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#11 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
Maybe we'll just say it's a pencil sharpener and leave it at that.
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#12 |
Registered User
Join Date: Jan 2014
Location: Sacramento,California
Posts: 696
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Re: What is this?
I believe it is a casting hole for a tube that might be used for another application. They used those carbs on more than just the chevy trucks. it would either be that or a cross drill port. usually they have plugs or pressed steel balls in them.
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Built not bought! My dad always tried to convince me HEI was pointless! Welding is a lot like sex, you don't have to be great with the rod as long as you thoroughly prep the surface and your good at grinding ![]() My build : 68 C10 Short Bed Conversion |
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#13 |
Registered User
Join Date: Jan 2014
Location: Murrieta, CA
Posts: 41
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Re: What is this?
It is a bowl vent for the carb. It used to go to the evap. canister when the system was in place.
Just cap. No harm. No fowl.
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1970 C 10 A work in progress!! ![]() |
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#14 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
Thanks for the info, I wonder what they were used for. Nice sig lol, reminds me of the shirts we sell at school that say " welders do it in all positions". Why are welders such pervs haha.
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#15 |
Registered User
Join Date: May 2014
Location: Mobile, AL
Posts: 422
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Re: What is this?
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#16 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: What is this?
I'll guess. I know from looking that a '72 1bbl is one year-only. It's my guess that '72 was the first year of the new casting. It has the PVC port designed into the carb but left it blank in '72 and continued using the PVC port location from prior years
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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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