Crankcase ventilation - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**smitty62** · 05-16-2004, 02:18 PM

I've got an old pair of the SoCal type valve covers that I'd like to powder coat and use, but they have no holes for a PCV valve or other crankcase ventilation. (I want to keep them that way). I've seen show cars/trucks with no evident ventilation holes in the valve covers. Any ideas on just how this is done? Is there a PCV valve hole hidden in some way?

walker · 05-16-2004, 03:00 PM

Older sbc's had the pcv valve in the back of the block. The original 327 that came in my pick up was that way.

68C15 · 05-16-2004, 03:48 PM

that's a tough one. you would need some sort of vent. whether it be PCV or atmospheric. what kind of intake do you have? is there a hole in front for oil fill tube? if so get a cap with a breather in it. otherwise maybe somehow attach a baffle assy from a 70's style VC to bottom front of intake & put PCV valve through a hole in intake. just brainstorming here. any one esle have any ideas?

**john** · 05-16-2004, 05:39 PM

I have seen PCV's screwed into the oil fill tube on front of intake with a sealed cap.

BtnkBndt · 05-16-2004, 07:49 PM

I'll gladly take those covers off your hands.

Here, I have a pic of how my 283 is vented through the rear of the block. The valve is actually threaded to the carb or inline.

**smitty62** · 05-16-2004, 08:23 PM

Yeah, I remember seeing those vents now. The valve covers had slits in them didn't they? They had to allow for air entry somewhere--was it the valve covers or elsewhere?

BtnkBndt · 05-16-2004, 08:35 PM

Air comes through the vent on top of the oil filler tube on the front of the manifold.

**smitty62** · 05-16-2004, 08:47 PM

Yep--I remember it now. But I'm still stuck as I don't want to run that oil filler either. The show cars I've mentioned didn't run them, so I'm still in a quandry as to how they do it.

neonlarry · 05-16-2004, 09:05 PM

Why do you think they call them trailer queens, you don't need too much ventilation driving them on and off a trailer.

Bowtie67 · 05-16-2004, 09:13 PM

Unless you have the early style block with the crank vent or filler tube in the front of the Intake manifold your pretty much screwed, Of coarse there is another solution and that would be to have a machinist drill a hole in the back of the block to allow for some type of ventilation, without it you will be forcing seals to blowout to release pressure. If the Valve covers you have are original GM they are collectable for those guys wanting to turn there old cars back to original.

05-16-2004, 02:18 PM	#1
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	Crankcase ventilation I've got an old pair of the SoCal type valve covers that I'd like to powder coat and use, but they have no holes for a PCV valve or other crankcase ventilation. (I want to keep them that way). I've seen show cars/trucks with no evident ventilation holes in the valve covers. Any ideas on just how this is done? Is there a PCV valve hole hidden in some way? __________________ Stepsides look like real trucks! Smitty

05-16-2004, 03:00 PM	#2
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	Older sbc's had the pcv valve in the back of the block. The original 327 that came in my pick up was that way. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

05-16-2004, 03:48 PM	#3
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	that's a tough one. you would need some sort of vent. whether it be PCV or atmospheric. what kind of intake do you have? is there a hole in front for oil fill tube? if so get a cap with a breather in it. otherwise maybe somehow attach a baffle assy from a 70's style VC to bottom front of intake & put PCV valve through a hole in intake. just brainstorming here. any one esle have any ideas? __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card

05-16-2004, 05:39 PM	#4
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	I have seen PCV's screwed into the oil fill tube on front of intake with a sealed cap. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

05-16-2004, 07:49 PM	#5
BtnkBndt Pennyless Fool Join Date: Oct 2003 Location: Forney,Tx Posts: 439	I'll gladly take those covers off your hands. Here, I have a pic of how my 283 is vented through the rear of the block. The valve is actually threaded to the carb or inline. Attached Images __________________ "Who owns this car with the peace sign, the mag wheels, and four on the floor?" 67 Short Step 283/TH400/4.11

05-16-2004, 08:23 PM	#6
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	Yeah, I remember seeing those vents now. The valve covers had slits in them didn't they? They had to allow for air entry somewhere--was it the valve covers or elsewhere? __________________ Stepsides look like real trucks! Smitty

05-16-2004, 08:35 PM	#7
BtnkBndt Pennyless Fool Join Date: Oct 2003 Location: Forney,Tx Posts: 439	Air comes through the vent on top of the oil filler tube on the front of the manifold. Attached Images __________________ "Who owns this car with the peace sign, the mag wheels, and four on the floor?" 67 Short Step 283/TH400/4.11

05-16-2004, 08:47 PM	#8
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	Yep--I remember it now. But I'm still stuck as I don't want to run that oil filler either. The show cars I've mentioned didn't run them, so I'm still in a quandry as to how they do it. __________________ Stepsides look like real trucks! Smitty

05-16-2004, 09:05 PM	#9
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Why do you think they call them trailer queens, you don't need too much ventilation driving them on and off a trailer. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

05-16-2004, 09:13 PM	#10
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	Unless you have the early style block with the crank vent or filler tube in the front of the Intake manifold your pretty much screwed, Of coarse there is another solution and that would be to have a machinist drill a hole in the back of the block to allow for some type of ventilation, without it you will be forcing seals to blowout to release pressure. If the Valve covers you have are original GM they are collectable for those guys wanting to turn there old cars back to original. __________________ 1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them"



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