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Discussion Starter · #1 ·
Reason I ask is cause I just got my head lights working but I had to disconnect the valve cover vacuum line. Don't worry I hooked it up to another thing with a bit less vacuum. Question is do I need a vacuum line to the valve covers or does the oil pump do the job just fine?
 

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Reason I ask is cause I just got my head lights working but I had to disconnect the valve cover vacuum line. Don't worry I hooked it up to another thing with a bit less vacuum. Question is do I need a vacuum line to the valve covers or does the oil pump do the job just fine?
You need a large vacuum source to the valve cover(s) with a PVC valve at the end. It does draw a measurable amount of flow. It helps relieve the crankcase of blowby gasses, preventing crankcase pressurizing. :thumbsup:
 

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If you want the PCV { Positive Crankcase Ventilation } system to work, you do. One valve cover will have the PCV valve in it with a vacuum line from intake vacuum. This "sucks" fumes from the engine crankcase into the engine to be burned instead of being vented to the atmosphere. As you are "sucking" from one valve cover you need cleaner air entering from another source, which would be the other valve cover hose which is hooked to the air cleaner where you sometimes find a small filter in the air cleaner.
I hope this helps, I am not clear which hose you removed.:cheers:
 

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You can remove both lines and install breathers and just vent the fumes into the air. You don't have to have a PCV for the motor to run right. It is just an emmissions thing. The only down fall to breathers is they do throw out a little oil on your valve covers that you have to periodically wipe off. But don't plug off the holes in the valve covers for that will cause pressure build up in the crankcase.
 

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Reason I ask is cause I just got my head lights working but I had to disconnect the valve cover vacuum line. Don't worry I hooked it up to another thing with a bit less vacuum. Question is do I need a vacuum line to the valve covers or does the oil pump do the job just fine?
Crafty, don't you have the pcv hose hooked up to the big connection on the carb base? You should also have a connection on the intake manifold for other vacuum devices.
 

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Discussion Starter · #6 ·
Here's the way I have it now: Victor Jr. intake manifold has a vacuum hose hook up and on that hook up I have the headlights, there are 2 vacuum thingies on the carb (small ones) and one is hooked up to the vacuum advance on the distributor and the other is on the PCV on the intake. Is that enough vacuum for both the distributor and the PCV?
 

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Here's the way I have it now: Victor Jr. intake manifold has a vacuum hose hook up and on that hook up I have the headlights, there are 2 vacuum thingies on the carb (small ones) and one is hooked up to the vacuum advance on the distributor and the other is on the PCV on the intake. Is that enough vacuum for both the distributor and the PCV?
There should be a big vacuum connection (approx. 3/8") on the carb base in the center under the secondary fuel bowl. That one is for the PCV connection. If you go to Barry Grants site and look up the Mighty Demon carb, you will see a photograph of the baseplate where they are talking about the Idle-Eze arrangement. You can clearly see this big connection there. Also, the Instruction Manual for the Mighty Demon states that this port exists in addition to the 2 small ones. The 2 small connections on the right hand side of the carb are ported vacuum and full vacuum, one each. The area of the large connection is 9 times the area of one of the small ones and that's why you want the PCV hose there.
 

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Discussion Starter · #8 ·
You da Mann Fred!! Found it! Thanks. That thing is well hidden under neath the rear fuel bowl. Thanks again for all the posts, this makes me love my vette even more by having other supportive members here on the forum!
 

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Discussion Starter · #9 ·
You da Mann Fred!! Found it! Thanks. That thing is well hidden under neath the rear fuel bowl. Thanks again for all the posts, this makes me love my vette even more by having other supportive members here on the forum!
 
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