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Need help with PCV hose on '77

Docmacs'77

Active member
Joined
Jul 30, 2005
Messages
30
Location
McAllen, TX
Corvette
1977 Black Coupe
My question: Does the PCV hose need to be connected to a vacuum source? If so, to where? either the front or rear manifold vacuum ports? (I have a Holley 750 vacuum secondary (4160). Right now I have my tranny vacuum connected to the front port, my distributor connected to the port on the right side (near the top just behind the front fuel bowl), and the power brake booster connected to the rear port. I've thought that the PCV is connected to the front port, but I'm a little confused about something. If indeed the PCV is connected to a vacuum source, for example if I was to "T" it in with the tranny vacuum at the front port, wouldn't there be a major vacuum drop since there's no real vacuum pull from under the valve cover? Wouldn't that affect the vacuum for the distributor, or whatever is connected with it there? Need some insight on this, and probably some advice on whether or not the distributor is connected to the right port - should it be connected to the front or rear port instead of the one on the side? Sorry for all the questions, but really kind of stuck here.
Thanks, Marc.
 
Docmacs'77 said:
My question: Does the PCV hose need to be connected to a vacuum source? ...

Nahh... just run dual breathers. Be warned- if you have emissions tests you'll never pass with dual breathers on the visual inspection.

If you run a search through google, you might be able to find a schematic for your carb's vacuum hoses.
 
just run it T-ed into the brake booster line. all the PCV needs is direct manifold vac. it should not effect your tranny or distributor vac, unless you have a huge vac leak from blown/missing seals in the motor.
 

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