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Old 08-05-2004, 11:44 PM
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Red face PCV Valve "rattling"

first, your forum saves people like me a bunch of hours and dollars spent on the "i don't know" people. I have a 72 Nova SS with a factory sunroof. I (and buddies) recenlty rebuilt my 350 with a slightly lumpy cam, some mild head work-stock..and after a nice drive i have a loud knocking sound from my PCV valve. I thought it was a rod, but it's the PCV itself. The faster the RPM, the louder it gets. Some power loss is noticable, and nobody seems to know what to do, i'm lost. Is this a carb that nees rebuilt (edelbrock650cfm) or maybe more severe???

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Old 08-05-2004, 11:48 PM
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Have you tried removing the PCV valve and running the engine? Do all of the problems you mentioned go away?
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Old 08-06-2004, 12:02 AM
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Could be a simple as a wasted pvc valve. Also are you getting your vacuum form the port at the base of the carb. If you are using a port on the intake near an intake runner your pvc might be affected by the intake valve opening and closing causing a pulsating vacuum source.
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Old 08-06-2004, 12:39 AM
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pcv

pony, good thinking, that "pulsating" sound right on the money. I'm using the vacum port at the base of the carb, is there another place that i should use, possibly on the intake, is there some guide on vacum that i should be getting from the carb, min or max, if not sufficent from the carb, would that indicate i need some carb work, or vacum leak...?
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Old 08-06-2004, 04:48 AM
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The fitting at the base of the carb is the preferred spot. Back to square one. Are you using the really thick walled vacuum line for the hook up. Regular gas/oil line type hose will collapse if used. Do as llucino77 says and cap off the vacuum out let at the carb to see what happens. If it runs good again replace the pvc valve. Good Luck.
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Old 08-06-2004, 07:41 AM
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I had this same problem w/the crate motor for our 40 chevy, that damn thing rattled like hell. i talked to my parts guy & he told try a different one for a different make chevy & low & behold it worked.. The PVC had a different part number then the one i was using.. SOOOOOO get a different PCV cause different motors have or needs different vacuum amounts & if someone disagrees then explain to ALL of us why they have so many different ones for cars that have basicly the same type motor... joe
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Old 08-06-2004, 11:47 AM
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PCV

Thanks guys, i was also told to get a different PCV. I have did replace it with at new one, "cheap fix" so that did not work. but maybe a stronger valve, since my engine isn't stock with the mods, would i get a new valve for like a 396, i guess it couldn't hurt. i'll get back to you, thanks again. I am using a "thick" hose for the conncection, I believe fuel line.
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