PCV Question
Thread Starter
|
Cross-Country
Joined: Aug 2014
Posts: 85
Likes: 0
From: Sioux Falls, SD
PCV Question
Hello, I am in the home stretch of getting my truck almost ready to hit the road. I just installed my new Holly Avenger 670 carb. I now need to determine what to do for air cleaner and the holes in the stock valve covers. I have a 1979 F150 4x4 that I swapped a 460 into. The motor has a complete build with a bunch of goodies including cam, aluminum intake, headers, carb, etc. What do I need to do for the two holes in the valve covers or recommendations? Do I plumb the passenger side with the PCV valve to the PCV port on the carb? If not what do I do. Also, what should I use for an oil fill cap for the drivers side valve cover? Does the require a PCV type cap that plumb to the same carb port as passenger? I am not sure if they require vacuum or can just vent to air.
Posting Guru
Joined: Aug 2010
Posts: 1,761
Likes: 8
From: Knoxville, TN
Driver vs passenger side just comes down to what's convenient to plumb.
One side should have a PCV valve and go to the PCV port on the carb, yes. The other side, you can either use a "breather cap" with a built-in filter, or you can use a cap with a port in it and plumb it to the air cleaner to get filtered air.
The system works by drawing filtered air in one side and then sucking out the other side through the PCV valve into the intake.
One side should have a PCV valve and go to the PCV port on the carb, yes. The other side, you can either use a "breather cap" with a built-in filter, or you can use a cap with a port in it and plumb it to the air cleaner to get filtered air.
The system works by drawing filtered air in one side and then sucking out the other side through the PCV valve into the intake.
Posting Guru
Joined: Aug 2010
Posts: 1,761
Likes: 8
From: Knoxville, TN
My preference is to use an OEM-style air cleaner (enclosed, with the snorkel) - that will let you keep a cold-air intake (ducted from the radiator support) rather than pulling hot air from under the hood. If you do that, there's already a provision on the back of it for a little filter that'll attach to a breather hose from the passenger valve cover - in that situation, you put the PCV valve on the driver side oil cap as it was from the factory.
The other option, if using an aftermarket open-air air cleaner, if it doesn't have a provision for a breather hook-up, is to use a breather cap that has a filter built in.
http://www.summitracing.com/search?S...breather%20cap
The other option, if using an aftermarket open-air air cleaner, if it doesn't have a provision for a breather hook-up, is to use a breather cap that has a filter built in.
http://www.summitracing.com/search?S...breather%20cap
Posting Guru
Joined: Aug 2010
Posts: 1,761
Likes: 8
From: Knoxville, TN
If you run with just a draft tube like in vehicles built before the 60s, you'll blow all the blowby out into the atmosphere, roughly double the hydrocarbon emissions from your vehicle, and get oil mist all over everything (creating a nasty mess of your engine bay).
Lead Driver
Joined: Feb 2002
Posts: 7,968
Likes: 595
From: Greater Austin, Texas
Trending Topics
Posting Guru
Joined: Aug 2010
Posts: 1,761
Likes: 8
From: Knoxville, TN
Yep, and it was actually voluntarily adopted by all the manufacturers before a federal mandate was ever put in place for it. (CA did require it a couple years before it ended up being rolled out nationwide). It's cheap and there's no downside to running it. Historically, it was actually invented to allow vehicles to ford deeper streams without sucking water into the crankcase in military applications during WWII, and then in the 50s, people realized it would also clean up the hydrocarbon emissions substantially.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
bruno2
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
11
Aug 30, 2016 06:39 PM
johnson2007
1973 - 1979 F-100 & Larger F-Series Trucks
2
Aug 21, 2011 11:39 PM
JoeHarbourJets
1973 - 1979 F-100 & Larger F-Series Trucks
3
Jul 27, 2011 07:29 AM
fordbeast_80
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
20
Sep 28, 2005 02:43 PM