Which PCV valve?
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,255
Likes: 0
From: Manalapan FL
Which PCV valve?
Picked up a Purolator PCV valve today (Part # PV774) as the book (and their website) called for ('74,350, 4bbl, J vin).
When I installed new valve, it was loose in its holder. The valve that I removed (unknown manf., stamped 7684) has a snug push-fit. When compared side-to-side, old valve was only s-l-i-g-h-t-l-y bigger around its base.
???
D. Ocean
Miami, FLA
When I installed new valve, it was loose in its holder. The valve that I removed (unknown manf., stamped 7684) has a snug push-fit. When compared side-to-side, old valve was only s-l-i-g-h-t-l-y bigger around its base.
???
D. Ocean
Miami, FLA
Drifting
Joined: Sep 1999
Posts: 1,908
Likes: 0
From: Manassas, VA, USA
Re: Which PCV valve? (74FLCONV)
When I installed new valve, it was loose in its holder.
Le Mans Master
Joined: Mar 1999
Posts: 6,744
Likes: 1
From: delmont pa
Cruise-In I Veteran
Cruise-In II Veteran
Re: Which PCV valve? (74FLCONV)
i would suggest using a genuine GM PCV valve as i have seen oil consumsion problems cause by after market PCV valve. i had one customer who rebuilt his engine and it still used oil and changing to a genuine GM valve solved the problem. :chevy
Le Mans Master
Joined: May 1999
Posts: 6,692
Likes: 29
From: Texas
Re: Which PCV valve? (clem zahrobsky)
Aren't PCV's just a check valve with what I will call a weight for the valve? What is special about a GM valve? I have the same problem, which I agree seems to be the PCV body diameter fractionally too small, allowing some oil leakage.
Le Mans Master
Joined: Mar 1999
Posts: 6,744
Likes: 1
From: delmont pa
Cruise-In I Veteran
Cruise-In II Veteran
Re: Which PCV valve? (Larry82)
i do not what the difference is but what got me on to this was a GM bulletin about oil burning in some cars was caused by the PCV not being a GM :chevy
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
Re: Which PCV valve? (clem zahrobsky)
Clem,
I replaced three PCVs in GM Sierra Vortec trucks in the last two weeks for this reason. There is a recall related to excessive oil consumption. It does concern the weight of the internal component of the PCV and what that component senses as normal vrs. excessive blow-by. But if your engine is not stock then this reasoning is not valid.
I replaced three PCVs in GM Sierra Vortec trucks in the last two weeks for this reason. There is a recall related to excessive oil consumption. It does concern the weight of the internal component of the PCV and what that component senses as normal vrs. excessive blow-by. But if your engine is not stock then this reasoning is not valid.
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