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: 98
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.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
