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#1
05-03-2010, 09:49 AM
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Need Help with Vacumn lines thru firewall
I have 3 holes in the firewall and two lines that need to go from under the dash out in the engine compartment. I snap a photo of the grommet and the 2 lines. One has a red stripe and the other has the original checkvalve still attached to it.
Which spots on the grommet does these go thru and where do they connect and what is the third hole for? Thanks for any help.
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74 GTO Bracket/Street car and another 74 for the wifey to race with! 70 GTO 400, 4 spd, #'s matching and a little to nice for me to own. Friendship is like peeing your pants..everyone can see it but only you can feel the warmth! |
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#2
05-03-2010, 03:52 PM
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Rob,mine is a 71' 4-speed.but since nobody replied so far.....
I have 3 holes in my grommet. One has wires wrapped in electrical tape coming out of it,the other has a vacuum line with the valve it it,that one goes up to my TVS switch. The 3rd hole is unused. This is on a pretty unmolested car. FWIW
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 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
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#3
05-03-2010, 05:00 PM
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I can't help you with all of it, but the line with the maroon stripe goes to the heater valve in front of the A/C evap.
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1964 GTO Auto 1970 GTO Ram Air III 4-speed 1972 Lemans Convert with endura option, 455, 4-speed |
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#4
05-04-2010, 07:32 AM
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Quote:
Hopefully someone can answer the rest of my question or post a pict.
__________________
74 GTO Bracket/Street car and another 74 for the wifey to race with! 70 GTO 400, 4 spd, #'s matching and a little to nice for me to own. Friendship is like peeing your pants..everyone can see it but only you can feel the warmth! |
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#5
05-11-2010, 06:01 PM
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I checked my 70 and coming out of my 3 openings are through the top hole is the maroon line that goes to the heater valve, below that is the one with the check valve going to the back of the carb for a vaccum source for your A/C controls, and lastly continuing clockwise is the wiring for the A/C stuff.
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1964 GTO Auto 1970 GTO Ram Air III 4-speed 1972 Lemans Convert with endura option, 455, 4-speed |
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#6
05-12-2010, 07:31 AM
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Quote:
Thanks for looking! 
__________________
74 GTO Bracket/Street car and another 74 for the wifey to race with! 70 GTO 400, 4 spd, #'s matching and a little to nice for me to own. Friendship is like peeing your pants..everyone can see it but only you can feel the warmth! |
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