350 guys PVC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67chevemall · 04-17-2008, 04:33 AM

Does it matter what side your put the PVC plug/valve?
And the breather on the other side....

Can these be switched around or is it set?

might be a dumb ?

70c10 · 04-17-2008, 04:45 AM

It can be on either side.

Blue85 · 04-17-2008, 04:47 AM

Dont matter which side it on, ive ran them on both sides with no trouble.

Highsteel · 04-17-2008, 04:50 AM

Quote:

Originally Posted by Blue85

Dont matter which side it on, ive ran them on both sides with no trouble.

True that. It is after all, just a vent to relieve crankcase pressure, is it not.

67chevemall · 04-17-2008, 04:54 AM

thanks guys
now I can rest...lol

1tigers · 04-17-2008, 05:22 AM

I believe its called a pcv valve.

Highsteel · 04-17-2008, 05:35 AM

Positive Crankcase Ventilation

Longhorn Man · 04-17-2008, 06:39 AM

no dumb questions

jrdv · 04-17-2008, 07:04 AM

What about not running a pcv and just having a breather on each side?
What's the downside?

Highsteel · 04-17-2008, 07:07 AM

A PVC valve vents the block into the carburetor and out the exhaust. A breather vents the block into the engine compartment. You choose.

67chevemall · 04-17-2008, 03:41 PM

does the carb need the hose going through it to function right?
I'm all for 2 breathers

Highsteel · 04-17-2008, 07:02 PM

Click this link for a better understanding of what the Positive Crankcase Ventilation system is and what it is used for.
Hope this helps you!

TonyJohnson · 04-17-2008, 10:12 PM

The key word is positive. A breather is a passive vent.

Longhorn Man · 04-18-2008, 03:31 AM

A good comparison of breathers verses PCV system;
Lest say you have a room filled with smoke, toxic gasses, acid in the air, and oil droplets. On one wall, there is a window, and on the oposite wall, another window.
Open the windows to clear the air in the room.
That's the breather set up.
Place a window fan that spins an insiane RPM and is able suck the room clean in a matter of moments, with fresh air coming in the other window supplying fresh air.
That's the PCV set up.

Rollie396 · 04-18-2008, 03:43 AM

Quote:

Originally Posted by Longhorn Man

A good comparison of breathers verses PCV system;
Lest say you have a room filled with smoke, toxic gasses, acid in the air, and oil droplets. On one wall, there is a window, and on the oposite wall, another window.
Open the windows to clear the air in the room.
That's the breather set up.
Place a window fan that spins an insiane RPM and is able suck the room clean in a matter of moments, with fresh air coming in the other window supplying fresh air.
That's the PCV set up.

I like that description.

Longhorn Man · 04-18-2008, 03:48 AM

Describing it like this would make anyone understand... even my mom, and it would take her 20 min to figure out where to put the oil.

Rollie396 · 04-18-2008, 03:50 AM

exactly.

muscletrucks · 04-18-2008, 05:49 AM

thanks highsteel for the link

dieselarmy13 · 04-18-2008, 05:42 PM

Breathers look cool, but they get oil all over your nice shiny valve covers. If you don't clean it all the time, it runs down to your ex. manifold and makes a stinky, and the ladies don't like the stinky.

jorgensensc · 04-18-2008, 06:07 PM

Quote:

Originally Posted by Longhorn Man

A good comparison of breathers verses PCV system;
Lest say you have a room filled with smoke, toxic gasses, acid in the air, and oil droplets. On one wall, there is a window, and on the oposite wall, another window.
Open the windows to clear the air in the room.
That's the breather set up.
Place a window fan that spins an insiane RPM and is able suck the room clean in a matter of moments, with fresh air coming in the other window supplying fresh air.
That's the PCV set up.

You almost described positive pressure ventilation in a house or structure fire. Reverse the fan to pushing the smoke (introducing fresh air) and the other window leeting the smoke out and you would have what we use in a structure fire. But for purposes of your explanation I will give you a little artistic flexibility

.
SHawn

04-17-2008, 04:33 AM	#1
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	350 guys PVC Does it matter what side your put the PVC plug/valve? And the breather on the other side.... Can these be switched around or is it set? might be a dumb ? __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

04-17-2008, 04:45 AM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: 350 guys PVC It can be on either side. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-17-2008, 04:47 AM	#3
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: 350 guys PVC Dont matter which side it on, ive ran them on both sides with no trouble. __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

04-17-2008, 04:54 AM	#5
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: 350 guys PVC thanks guys now I can rest...lol __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

04-17-2008, 05:22 AM	#6
1tigers Registered User Join Date: Apr 2008 Location: auburn,al. Posts: 32	Re: 350 guys PVC I believe its called a pcv valve.

04-17-2008, 05:35 AM	#7
Highsteel Chasin' the Dream Join Date: Mar 2008 Location: Lost in the 70's Posts: 200	Re: 350 guys PVC Positive Crankcase Ventilation

04-17-2008, 06:39 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 350 guys PVC no dumb questions

04-17-2008, 07:04 AM	#9
jrdv Registered User Join Date: Apr 2000 Location: new mexico Posts: 948	Re: 350 guys PVC What about not running a pcv and just having a breather on each side? What's the downside? __________________ 1972 3/4T 4x4 Chevrolet (383) 1971 c-10 SWB (400 sb) 1972 4x4 Blazer 1969 SWB 4x4 GMC Projects: 1972 stepside 4x4 http://67-72chevytrucks.com/vboard/s...d.php?t=280132 http://67-72chevytrucks.com/vboard/s...d.php?t=285952 http://67-72chevytrucks.com/vboard/s...d.php?t=553672 http://67-72chevytrucks.com/vboard/s...d.php?t=522704

04-17-2008, 07:07 AM	#10
Highsteel Chasin' the Dream Join Date: Mar 2008 Location: Lost in the 70's Posts: 200	Re: 350 guys PVC A PVC valve vents the block into the carburetor and out the exhaust. A breather vents the block into the engine compartment. You choose.

04-17-2008, 03:41 PM	#11
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: 350 guys PVC does the carb need the hose going through it to function right? I'm all for 2 breathers

04-17-2008, 07:02 PM	#12
Highsteel Chasin' the Dream Join Date: Mar 2008 Location: Lost in the 70's Posts: 200	Re: 350 guys PVC Click this link for a better understanding of what the Positive Crankcase Ventilation system is and what it is used for. Hope this helps you!

04-17-2008, 10:12 PM	#13
TonyJohnson Registered User Join Date: Mar 2003 Location: Cheboygan, MI Posts: 998	Re: 350 guys PVC The key word is positive. A breather is a passive vent. __________________ Tony Johnson -- '71 Blazer w/L-31 Vortec 350, SM465, NP205, performer intake, edelbrock 1406, HEI, 4" lift, Boyd EFI tank, Vintage A/C My Blazer --

04-18-2008, 03:31 AM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 350 guys PVC A good comparison of breathers verses PCV system; Lest say you have a room filled with smoke, toxic gasses, acid in the air, and oil droplets. On one wall, there is a window, and on the oposite wall, another window. Open the windows to clear the air in the room. That's the breather set up. Place a window fan that spins an insiane RPM and is able suck the room clean in a matter of moments, with fresh air coming in the other window supplying fresh air. That's the PCV set up.

04-18-2008, 03:48 AM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 350 guys PVC Describing it like this would make anyone understand... even my mom, and it would take her 20 min to figure out where to put the oil.

04-18-2008, 03:50 AM	#17
Rollie396 someday it will be done! Join Date: Sep 2004 Location: Lloydminster,AB. Canada Posts: 1,620	Re: 350 guys PVC exactly. __________________ '72 C-10 Proud owner of a million new and used pieces that used to be and will once again be(god willing) a testament to the term "they don't build em like that anymore. '80 LWB 2wd beater '67 GMC long fleet (cab donor) '66 long step (parked till it's turn comes around) '65 short step (parts truck that will donate it's bed and possibly frame to the '66) '06 Grand Prix wife's car (she hardly lets me touch it) my pics



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04-18-2008, 05:49 AM	#18
muscletrucks Registered User Join Date: Mar 2008 Location: Kansas City Posts: 431	Re: 350 guys PVC thanks highsteel for the link __________________ 1972 GMC Sierra Grande 3/4 Ton 4x4 1970 Mercury Cougar XR7 1943 Farmall M

04-18-2008, 05:42 PM	#19
dieselarmy13 Phone's ringin Dude. Join Date: Mar 2007 Location: Colorado Springs Posts: 1,426	Re: 350 guys PVC Breathers look cool, but they get oil all over your nice shiny valve covers. If you don't clean it all the time, it runs down to your ex. manifold and makes a stinky, and the ladies don't like the stinky. __________________ I pitty the fool with only two headlights!! 2003 SILVERADO SS--THE NEW GIRL 1972 GMC--THE OLD GIRL

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