Breather/oil-fill tube in later-style intake - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cris well · 08-05-2010, 10:59 PM

Has anyone ever done this? it's a 74-76 model cast iron 4-barrel SBC and i want the old school look with script valve covers and breather tube.

it looks like it would work but i'd like to know if anyone else has done it and what i should expect.

i already have the double humps and valve covers.

thanks

oldblue1968chevy · 08-05-2010, 11:34 PM

Hmm and you wanna run the later style intake?..I think you'd have to get an aftermarket intake (performer eps has an oil filler on the intake), you could MAYBE cut a hole in the intake you have but I doubt it...

post a pic when you get it all done, i love that look!

why not get an older model junkyard intake with the filler on the intake
?...

cdowns · 08-05-2010, 11:39 PM

it can b done what you can expect is heavy sludge buildup inside the engine as well as leakage of oil out the engine // just like the old ones were

oldblue1968chevy · 08-05-2010, 11:49 PM

Why do they still sell em then?...(not argueing just wondering..)

**oldgold70c10** · 08-05-2010, 11:57 PM

I have a 1968 intake off a 327 on my 350. It has the twist on non-breather oil fill cap & tube and uses a PCV valve and breather on the valve covers.

cdowns is right, PCV makes things stay a lot cleaner. I've seen where some people have added holes to the back ends of those script valve covers for the breather & PCV valve.

oldblue1968chevy · 08-06-2010, 12:09 AM

yeah ive seen where you run a breather pcv on the backs also..

**leddzepp** · 08-06-2010, 12:11 AM

I would never run a vehicle without PCV.

Sinister · 08-06-2010, 10:30 AM

Quote:

Originally Posted by leddzepp

I would never run a vehicle without PCV.

X2. I ran breathers only on a 350. My oil turned to sludge, which might have been the cause of a rod going through my oil pan.

cris well · 08-06-2010, 01:50 PM

yea i'm still gonna run a pcv valve but i just want the old-style look.

someone has already cut a hole in one of the covers (i wish it was in the back) and they have breathers on them too.

will an HEI dizzy work on the old intakes? i was gonna buy an old edelbrock cb3-x (i think) with the breather tube but i found out the HEI would hit it.

i want it old-style but not with a points dizzy.

here are the covers.

cdowns · 08-06-2010, 02:43 PM

oil runs down// do ya think havin a breather on the bottom of a valve cover is a well thought out approach or a major leaky on the headers??

plenty of manufacturers have HEI dizzys with small caps and external coil to reproduce the original look and fit

cris well · 08-06-2010, 05:48 PM

i hadn't really thought about the them leaking.

i think they should be alright though.

has anyone else ever had problems with them?

the holes are about mid-way and the breathers have a 90 bend in them. they seal to the covers with a gasket.

epashhans · 08-06-2010, 05:59 PM

Did you get them for a good deal? That might be why. They look like you would have a problem with leaking like cdowns said...and right onto the exhaust manifold. Darn.

cdowns · 08-06-2010, 06:22 PM

you're special the laws of physics dont apply to you????

*lakeroadster* · 08-06-2010, 06:40 PM

I did this on my Model A that runs a '70 Chevy 350 SBC and old aluminum "corvette" valve covers. I had an Eldebrock RPM intake machined to use the old intake style filler tube and then put a breather on it. The RPM intake had the boss there, just needed the hole machine for it.

I found out the hard way that the crankcase needed more room to breathe. On a new engine that isn't broken in, or on an old engine that has a lot of blow by thi will be an even bigger problem. In my case, with a newly rebuilt engine, I blew out the manual Holley gas pump gaskets and spewed oil all over the headers, thought I had blown up the engine! Luckily I rebuilt the fuel pump and all was good.

I changed the oil filler neck to the type that is used on a '66-67 vette, it is equipped with a PCV Valve fitting. I also added a Moon breather in drivers side "vette" valve cover.

It has worked fine since these modifications.

I hope this helps.

cris well · 08-07-2010, 12:21 AM

thanks lakeroadster.

that's a nice ride you have there and i may wind up doing something similar to your set-up.

cleanfreak · 08-11-2010, 12:23 AM

i used the corvette covers uncut , breather on front of intake, cut hole for pcv in back of intake (old single plane edelbrock) and ran pcv from back to hole at plenum. keeps oil mes down , but pcv is sucking to much oil from lifter valley , have to figure out a better baffle.Hope this helps

08-05-2010, 10:59 PM	#1
cris well Registered User Join Date: Oct 2009 Location: atlanta, ga Posts: 318	Breather/oil-fill tube in later-style intake Has anyone ever done this? it's a 74-76 model cast iron 4-barrel SBC and i want the old school look with script valve covers and breather tube. it looks like it would work but i'd like to know if anyone else has done it and what i should expect. i already have the double humps and valve covers. thanks

08-05-2010, 11:34 PM	#2
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Breather/oil-fill tube in later-style intake Hmm and you wanna run the later style intake?..I think you'd have to get an aftermarket intake (performer eps has an oil filler on the intake), you could MAYBE cut a hole in the intake you have but I doubt it... post a pic when you get it all done, i love that look! why not get an older model junkyard intake with the filler on the intake ?... __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

08-05-2010, 11:39 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Breather/oil-fill tube in later-style intake it can b done what you can expect is heavy sludge buildup inside the engine as well as leakage of oil out the engine // just like the old ones were __________________ 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

08-05-2010, 11:49 PM	#4
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Breather/oil-fill tube in later-style intake Why do they still sell em then?...(not argueing just wondering..) __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

08-05-2010, 11:57 PM	#5
oldgold70c10 Who's got steelies? Join Date: Feb 2006 Location: Morrison, Oklahoma Posts: 1,025	Re: Breather/oil-fill tube in later-style intake I have a 1968 intake off a 327 on my 350. It has the twist on non-breather oil fill cap & tube and uses a PCV valve and breather on the valve covers. cdowns is right, PCV makes things stay a lot cleaner. I've seen where some people have added holes to the back ends of those script valve covers for the breather & PCV valve. __________________ 1969 C10 LWB W/ 250 I6 & 3spd 1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver. 1975 Chevelle Malibu Classic Coupe 350/th350 mint green 1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel

08-06-2010, 12:09 AM	#6
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Breather/oil-fill tube in later-style intake yeah ive seen where you run a breather pcv on the backs also.. __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

08-06-2010, 12:11 AM	#7
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,117	Re: Breather/oil-fill tube in later-style intake I would never run a vehicle without PCV. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

08-06-2010, 01:50 PM	#9
cris well Registered User Join Date: Oct 2009 Location: atlanta, ga Posts: 318	Re: Breather/oil-fill tube in later-style intake yea i'm still gonna run a pcv valve but i just want the old-style look. someone has already cut a hole in one of the covers (i wish it was in the back) and they have breathers on them too. will an HEI dizzy work on the old intakes? i was gonna buy an old edelbrock cb3-x (i think) with the breather tube but i found out the HEI would hit it. i want it old-style but not with a points dizzy. here are the covers. Attached Images

08-06-2010, 02:43 PM	#10
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Breather/oil-fill tube in later-style intake oil runs down// do ya think havin a breather on the bottom of a valve cover is a well thought out approach or a major leaky on the headers?? plenty of manufacturers have HEI dizzys with small caps and external coil to reproduce the original look and fit __________________ 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

08-06-2010, 05:48 PM	#11
cris well Registered User Join Date: Oct 2009 Location: atlanta, ga Posts: 318	Re: Breather/oil-fill tube in later-style intake i hadn't really thought about the them leaking. i think they should be alright though. has anyone else ever had problems with them? the holes are about mid-way and the breathers have a 90 bend in them. they seal to the covers with a gasket. Attached Images

08-06-2010, 05:59 PM	#12
epashhans Registered User Join Date: Jul 2009 Location: MT Posts: 319	Re: Breather/oil-fill tube in later-style intake Did you get them for a good deal? That might be why. They look like you would have a problem with leaking like cdowns said...and right onto the exhaust manifold. Darn. __________________ '67 C-10 Shorty - 454, 5spd, and speed holes!

08-06-2010, 06:22 PM	#13
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Breather/oil-fill tube in later-style intake you're special the laws of physics dont apply to you???? __________________ 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

08-06-2010, 06:40 PM	#14
lakeroadster Account Suspended Join Date: Sep 2009 Location: High Plains of Colorado Posts: 2,485	Re: Breather/oil-fill tube in later-style intake I did this on my Model A that runs a '70 Chevy 350 SBC and old aluminum "corvette" valve covers. I had an Eldebrock RPM intake machined to use the old intake style filler tube and then put a breather on it. The RPM intake had the boss there, just needed the hole machine for it. I found out the hard way that the crankcase needed more room to breathe. On a new engine that isn't broken in, or on an old engine that has a lot of blow by thi will be an even bigger problem. In my case, with a newly rebuilt engine, I blew out the manual Holley gas pump gaskets and spewed oil all over the headers, thought I had blown up the engine! Luckily I rebuilt the fuel pump and all was good. I changed the oil filler neck to the type that is used on a '66-67 vette, it is equipped with a PCV Valve fitting. I also added a Moon breather in drivers side "vette" valve cover. It has worked fine since these modifications. I hope this helps. Attached Images Last edited by lakeroadster; 08-06-2010 at 06:48 PM.

08-07-2010, 12:21 AM	#15
cris well Registered User Join Date: Oct 2009 Location: atlanta, ga Posts: 318	Re: Breather/oil-fill tube in later-style intake thanks lakeroadster. that's a nice ride you have there and i may wind up doing something similar to your set-up.

08-11-2010, 12:23 AM	#16
cleanfreak Registered User Join Date: Oct 2009 Location: port robinson ontario canada Posts: 401	Re: Breather/oil-fill tube in later-style intake i used the corvette covers uncut , breather on front of intake, cut hole for pcv in back of intake (old single plane edelbrock) and ran pcv from back to hole at plenum. keeps oil mes down , but pcv is sucking to much oil from lifter valley , have to figure out a better baffle.Hope this helps



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