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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: scorpion on April 09, 2013, 11:23:22 pm
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I swapped a Gen V 454 into my '74 k20. The factory valve covers don't have a breather hole or PCV. When I get up around 2500 rpm, oil blows out of the dipstick, the valve covers won't seal, and...it's basically a freakin' mess. My 350 had a PCV (also a '95 with vortec heads) and it didn't leak. I did a little research and it appears that there are many opinions as to if a PCV & breather is the good solution or not. Some say they will cause vacuum issues and could cause problems with the brakes. The Chevrolet Performance 502 comes standard with covers that have breathers however separately the covers have a disclaimer that states the covers GENERALLY (just like that - in bold) work with power brakes which kinda supports some of those opinions. Other threads stated that they couldn't get the motor to idle smoothly. I'd like to get this set
(http://img.tapatalk.com/d/13/04/10/a3u4ygas.jpg) which are essentially just like the ones I have except they have baffled holes which would allow me to run a PCV & breather combo if it will solve my problem without creating new ones. Can anyone confirm if adding breathers to a Gen V will have any negative side effects or is it just gonna solve my problem like I think it will? Thanks.
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Definitely run a PCV and breather. PCV on one valve cover and the breather on the other. PCV hooks to large port on carburetor base plate. PCV is a controlled vacuum leak, but unless you have a large cam and low vacuum, it should be fine.
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Definitely run a PCV and breather. PCV on one valve cover and the breather on the other. PCV hooks to large port on carburetor base plate. PCV is a controlled vacuum leak, but unless you have a large cam and low vacuum, it should be fine.
That's what I thought. Awesome, thanks.