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Old 05-10-2013, 10:34 PM
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Pcv hook up

Ok so I'm trying to clean up my engine bay a little bit and I was wondering, instead of having the pcv valve hooked up to the port on the carb, could I hook it up to the fitting that sits on the back of the intake directly in front of the distributor and behind the carb?

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Old 05-10-2013, 11:56 PM
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You can hook it to your intake to pull vacuum, but you need to make sure it is not too close to one or a couple of runners (which will probably be the case). The engine is pulling oily gasses from the engine and if it is too close to one or 2 runners, it can cause issues in those cylinders. Those gasses can knock down the octane of the fuel and can cause detonation in one or those couple of cylinders. My opinion is it is best to keep it on the carb so it is more evenly distributed.
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Old 05-11-2013, 10:12 AM
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Ok, what if I hooked up the Pcv to the port on the back of the carb and hook the brakes to the port on the back of the intake?
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Old 05-11-2013, 10:31 AM
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I undersatnd that your goal is to clean up your engine look but sometimes ugly lines are necessary. Edelbrock doesnt recommend to run the pcv on the back port only brake booster. I have run my pcv on the manifold with no problems before but I only had that engine for about 3000 miles before I sold it so I dont know what the long term effect would be on those cylinders. Anywhoo, here are some ideas... you can try looking for an air cleaner base with with a barb on the underside that will hook up to the pcv kind of like the old stock wouldve had. They come chrome so they look nice. Another option would be a carb spacer that also has a barb depending on hood clearance, might work. Finally maybe run some nice braided vacuum lines to the correct port in the front. If you cant hide it, make it look nice. Hope this helps
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Old 05-11-2013, 10:57 AM
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That sounds like a good idea too! Just trying to make it all look pretty haha
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Old 05-11-2013, 11:48 AM
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Quote:
Originally Posted by 1badLemans View Post
...
you can try looking for an air cleaner base with with a barb on the underside that will hook up to the pcv kind of like the old stock wouldve had. They come chrome so they look nice. Another option would be a carb spacer that also has a barb depending on hood clearance, might work.
...
Carb spacer plate is a good idea, but he already has a port on the back of the carb, right? So nothing to be gained there.

For anyone that wants to know, though ... '68 Ford Galaxie 390 4-barrel uses a nice slim phenolic spacer plate. (Ford carb bolt mountin pattern is same as squarebore Holley)

As far as the air cleaner goes, though ... that is not intended as a vacuum source ... very little vacuum there unless your air filter is plugged.

It is designed to be the air inlet source for PCV air only ... providing filtered air. In order to have Positive Crankcase Ventilation ... you need a hose going to both valve covers ... in order to have air FLOW.


You CAN use a filtered breather cap


directly on the valve cover for the inlet, but there is not a lot of filter capacity there.
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Old 05-11-2013, 11:07 PM
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Thanks guys!
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