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Mod | | | Forums66 Topics128,089 Posts1,056,004 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Apr 2010 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2010 Posts: 48 | Hi I have a 1967 c 50. 327 motor. Now when I take off the oil filler cap,the rpm goes up. Then replace the oil filler cap,the rpm drops why? Now there is no vent on valve covers.
Last edited by crockbuyer; 10/26/2016 12:24 AM.
| | | | | Joined: Oct 2002 Posts: 4,066 Bolter | | Bolter Joined: Oct 2002 Posts: 4,066 | does this make sense................basically your creating a vacuum leak thru the intake that vents the crankcase and oil tank
Redryder pixMy HotrodA veteran - whether active duty, retired, national guard, or reserve - is someone who, at one point in his or her life, wrote a blank check made payable to The 'United States of America', for an amount of "up to and including my life."I am fighting cancer and I am winning the fight | Pain is part of life; misery is an option. | | | | | Joined: Feb 2004 Posts: 29,787 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,787 | Is there a PCV valve installed? If so, you need a vented oil fill cap or a set of valve covers with a grommet for a vent pipe connected to the "clean" side of the air filter. Without a vent, the PCV cannot work properly.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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