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04-08-2023, 09:42 PM
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#1 |
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Registered User
 
Join Date: Sep 2003
Location: Wichita, KS
Posts: 3,744
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Why two holes in the cab floor?
Pulled the plug in this cab floor today. Got me thinking that I've seen a lot of trucks with this plug, but never seen the 2nd hole used for anything.
Why did they put in the second hole? I searched but didn't find anything... |
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04-08-2023, 10:01 PM
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#2 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,636
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Re: Why two holes in the cab floor?
I think I remember them for cab alignment when welding.
__________________
1969  307, t3501950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
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04-10-2023, 01:56 PM
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#3 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 7,067
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Re: Why two holes in the cab floor?
That second hole comes in handy when converting to EFI, as you can use it for the return line.
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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04-10-2023, 01:56 PM
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#4 |
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Registered User
Join Date: Jul 2016
Location: Arkansas
Posts: 147
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Re: Why two holes in the cab floor?
Mine only has one hole. Is it certain years?
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04-10-2023, 03:20 PM
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#5 |
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Senior Member
 
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,692
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Re: Why two holes in the cab floor?
One is for fuel line(s) the other for the vent line, which many have since been removed
__________________
Tony 1971 C10 Custom Deluxe SWB 402/400TH A/C I developed an assembly information kit for restoring my truck from nuts and bolts. It's written in Assy. order, short & simple, packed with all OEM hardware ID; castings; part ID; 100s of part numbers; wiring simple - Resource, and trivial too. Much info. applies to all 67-72 GM, A/C vehicles, esp. trucks W/O saying. Full search ability, including to 700+ images of illus., parts, charts, Assy., points of interest, cab, bed, & front clip cart plans- Specials and cores were serviced out and R excluded e.g. front/rear glass, body/paint, engine core, rebuilt hinges, steering box, trans, etc. The project was in-line with long former professions developing process, policy, specs, demo, written for novices, admin., policy, engineers, development, systems & test - Public & govt 2, gross. Sell soft copy cheaply, PM if interested.Build thread:https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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04-10-2023, 04:35 PM
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#6 | |
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Registered User
Join Date: Sep 2003
Location: Wichita, KS
Posts: 3,744
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Re: Why two holes in the cab floor?
Thanks for all the replies.
Quote:
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04-11-2023, 02:39 AM
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#7 |
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Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 3,346
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Re: Why two holes in the cab floor?
My 72 K10 built in Freemont, California and sold in Nevada to a California resident with the smog equipment has those two holes. Been some time since I removed the stock tank and installed the rear tank, but I seem to remember a line going though that hole. A 1" plug takes care of both.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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