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#1 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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Valve cover / pcv question
I am looking at this set of valve covers and I have a question. Is there anything wrong with venting the pcv/breather out the back of the valve cover? Where would you run it to? Underside of the air cleaner base? Thanks guys.....
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#2 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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Sorry, here's the other pictures.
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#3 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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One more.....
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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you really should have baffeled covers to prevent oil being sucked into the carb
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#5 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Not only that all PVC systems have a check valve in them to prevent gas vapors from
getting into the oiling system, and also from overpressurizing the crankcase and blowing seals. I don't think it matters where the vent is if these two criteria are met. I kinda like the clean look it gives. VetteVet
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#6 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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Didn't the mid-80's pontiac V-8's come off the valve covers right into the air cleaner? They just had a "clip-on" filter to keep oil from getting into the carb. Was there anything else in between there i'm missing? Thanks for the responses guys.......Jerry
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#7 | |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,553
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Quote:
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#8 | |
Registered User
Join Date: Nov 2004
Location: Cameron, Oklahoma
Posts: 199
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Pcv
Quote:
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72 Cheyenne SWB Fleet/original 402, TH400, buckets & console 65 C10, 350TBI, 700R4 (work in progress) |
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#9 |
Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
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The best thing to do with that valve cover is to just take out that fitting and plug it. Those covers have a place that you can remove (drill or punch out) in the top of them for the oil fill and PCV valve. That was used for racing purpose and you wouldnt want to use it on a street aplication. I have been watching these and was going to bid on them and do what i said here, but If you are interested in them I will not bid. They are nice covers and would look great on an engine. Happy bidding and hope you get them.
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For every person with a spark of genius, There are a hundred with ignition trouble. ![]() |
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#10 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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Is there a site somewhere that would explain the pcv system for me so I can get a handle on what is what? Thanks guys..........Jerry
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#11 |
More Cowbell....
Join Date: Mar 2004
Location: Puckett, MS
Posts: 3,569
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I saw those on the E-bay yesteday. Looked kinda cool, BUT WHERE DOES THE OIL GET INSTALLED on oil-change day??? I aint pulling the dizzy to do that.
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There once was a member from Puckett.....Who ( fill in the blank blank blank ) bucket |
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#12 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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Maybe the other valve cover has the oil fill? I can't remember and lost the link.
70 Short/Step - I'm not bidding on them, I just wanted to figure out how he was making that work. Reason being, I have a pair of new-in-the-box billet valve covers that don't have any holes drilled in the top and I kinda like that smooth look and was wondering if there was a way to keep that look and still have everything working as it should. Any idea's will be appreciated........Jerry
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#13 |
Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
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Those valve covers that you have in the pics are Performance chevy parts and are worth about $230. Like I said before, you have to punch or drill holes in them for the oil fill and PCV valve. There are bosses in the covers to do this. If you have valve covers that have no holes for oil fill or PCV valve I do not know of any other way to vent the crankcase on a newer post 67 year. Earlier year engines had a tube in the back of the block to vent the crankcase and it just let the oil run out onto the road. The way you put oil in these older engines was the front of the intakes had a tube that stuck up with an oil cap on them. And Putter, I would pull a valve cover (if I had to) instead of the dizzy to add oil! Hope this helps you.
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For every person with a spark of genius, There are a hundred with ignition trouble. ![]() Last edited by 70short/step; 03-10-2005 at 12:42 PM. |
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#14 |
Registered User
Join Date: Dec 2002
Location: Tampa
Posts: 1,191
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A PCV valve isn't absolutely needed. You could run a small catch can off the AN fittings on the back of the valve covers. If you ensured that it was mounted higher than the valve covers you won't have any problem and a PCV is unnecessary as it's being vented to atmosphere. Also you wouldn't have to worry about baffles either. You can even put a vented filter directly on the valve cover but those tend to allow a slight oil mist over the valve cover and engine. As far as the PCV valve I think it's purpose is to prevent ignition of vapors in the top end in the event of a backfire.
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'68 Short Step LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc |
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#15 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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Okay, side question. What would happen if I just vent one side? Is that sufficient or do both sides need to be ventilated?
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#16 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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The 350 in my 69 has valve cover from old school withn the CHEVROLET scroll on it ( closed ) on the drivers side and a breather oil fill on the front of a later model with a pvc port at the rear and a tube to the aircleaner with pcv in line on the passengers side. It seems kinda wrong to me since the draw and vent are all on one side. I think oil fill on one side ( vented cap) and the pcv port and hose to intake manifold on the opposite side would draw air across and through the engine better. But maybe this isn't even necessary. Perhaps the set up the PO put on this engine is fine.
I am rebuilding another 350 or 400 to put back in the truck and I have a set of the old stock closed covers that I realy wish to run, but still trying to figure out how Dave |
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#17 | |
Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
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Quote:
The PCV valve requires little maintenance. The valve and filter should be replaced somewhere around 30,000 to 50,000 miles (see the vehicle owners manual for service intervals). ![]()
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For every person with a spark of genius, There are a hundred with ignition trouble. ![]() Last edited by 70short/step; 03-10-2005 at 08:54 PM. |
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#18 |
Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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I have heard that crankcase ventilation will add life to the crank bearings and rod bearings.Without it the crank spins and splashes the oil and can form small bubbles of air in the oil not letting the oil adhere as well to the moving parts causing premature wear on the crank.
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