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Old 03-08-2010, 12:38 PM
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Vacuum Hoses

I Have a Holley Contender Intake and it has one port for vacuum and i was told not to tee any vacuum lines. Where should i route my modulator valve line and my advance on my distributor

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Old 03-08-2010, 02:36 PM
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vacuum hoses

If your carbs base plate has a port you can use it for the distributor. I think that holly carbs have manifold vacuum ports on them if it is below the butterflys then it is probably manifold vacuum.
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Old 03-08-2010, 04:48 PM
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You can tee off of vacuum lines. My '69 Chevy C-20 had a tee from the factory for the transmmision modulator and power brakes.
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Old 03-08-2010, 07:19 PM
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dizzle

I have a factory quadrajet so where to???
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Old 03-08-2010, 07:21 PM
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sinister

yes you can tee the lines off but it will take away from the vacuum
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Old 03-08-2010, 07:21 PM
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Manifold vacuum port off the Quadrajet, but I would run off the intake manifold if possible.
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Old 03-08-2010, 07:24 PM
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which should i run

what should i run to the intake and what shuold i run to my carb??? The only vaccum i am running is Distributor,power Brakes,Trans mod valve and PCV
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Old 03-08-2010, 07:37 PM
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Run a fitting like this in the intake for the modulator and brakes, run the distributor off the carb, PCV to the carb. http://www.classicindustries.com/con...rchCatalogId=1
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Old 03-08-2010, 08:04 PM
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thank you

thank you sinister
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Old 03-09-2010, 09:09 PM
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This is the factory setup on my 1975 SBC 350.

- Intake fitting on the back of the manifold - this fitting has a short hose and then a multi-point connector, which connects to the TH350 kickdown, vacuum door on the air cleaner snorkel, and to the HVAC canister

- Power Brake booster connects to the large port on the back of the Quadrajet, using a short section of steel line with a fitting that screws into the back of the carb.

- Distributor vacuum advance connects to ported vacuum on the front of the carburetor (small port on the front)

- Rubber line to the PCV valve connects to the large port on the front of the carburetor

That arrangement is the factory setup for 1975 HD truck emissions, and its just about the bare minimum set of vacuum lines you can use. Of course, if you have a race vehicle you might get by without lines for vacuum advance, PCV valve, and HVAC.

Bruce
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