![]() |
|
![]() |
#1 |
Registered User
Join Date: Sep 2011
Location: Jacksonville, FL
Posts: 143
|
Crankcase Breather?
My bone stock '72 350 has a 3 inch 'hat' om top of the carb, and the 3 inch air cleaner. There's no crankcase breather in the air cleaner. But there is a tube from the valve cover that goes into the hat, and there's no breather. See the pic... I have no reason to think this is not stock, just never seen it before. Seems like without the breather it's just going right into the carb...
__________________
1972 Cheyenne Super LWB, 350V8, AC, PS, PB, all original 46k survivor Last edited by LockDoc; 02-28-2021 at 11:39 AM. Reason: sized picture down |
![]() |
![]() |
![]() |
#2 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
|
Re: Crankcase Breather?
It already has filtered air going into the valve cover from the air cleaner.
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Sep 2011
Location: Jacksonville, FL
Posts: 143
|
Re: Crankcase Breather?
Ah, ok... I had the airflow reversed in my head. Thanks!
__________________
1972 Cheyenne Super LWB, 350V8, AC, PS, PB, all original 46k survivor |
![]() |
![]() |
![]() |
#4 |
Mr. Cheyenne
![]() Join Date: Jun 2020
Location: Kyle, Texas
Posts: 1,688
|
Re: Crankcase Breather?
My C10 72 is just like that. Though, I don't have a fancy oil fill tube - is that thing stock? if so where do I get one for my truck (and where the hell did it go??)!
__________________
Richard '72 Chevy C10 Cheyenne *Super WHT/MED BRONZE/WHT SBC 350 | TH350 | LWB | AC | Buddy Seats Upgrades: Tilt | Front Sway Bar | Radio | Sliding Window | Bed Spare w/Lock Bed Rails | Full LEDs | Courtesy Lights | Tachometer | Glovebox Lock & Light | Head Light Relays | *Upgraded Fully Super Trim |
![]() |
![]() |
![]() |
#5 | |||
Always on the hunt...
![]() Join Date: Sep 2006
Location: Portland, OR.
Posts: 5,602
|
Re: Crankcase Breather?
Quote:
Quote:
Quote:
![]() http://67-72chevytrucks.com/vboard/s...d.php?t=818966 . Last edited by Classic Bowties; 03-01-2021 at 02:26 PM. Reason: added pic |
|||
![]() |
![]() |
![]() |
#6 |
Registered User
![]() Join Date: Oct 2013
Location: CT.
Posts: 260
|
Re: Crankcase Breather?
Hello, I think that the "Hat" is called an air cleaner spacer, The tube allows air the engine is sucking in to come from the crank case thru the engine and the flame arrester to the tube.
The spacer, tube and arrester are stock. I am not sure if its called a flame or spark arrester but that's the part between the tube and the valve cover. Hope this helps. K.E.N. |
![]() |
![]() |
![]() |
#7 | |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,594
|
Re: Crankcase Breather?
Quote:
Air into the motor from the riser thru the hose and arrestor into the valve cover. The air combines with moisture and gas fumes and then it’s all pulled out the other side by the pcv valve. |
|
![]() |
![]() |
![]() |
#8 |
Mr. Cheyenne
![]() Join Date: Jun 2020
Location: Kyle, Texas
Posts: 1,688
|
Re: Crankcase Breather?
that helps me - thanks!
__________________
Richard '72 Chevy C10 Cheyenne *Super WHT/MED BRONZE/WHT SBC 350 | TH350 | LWB | AC | Buddy Seats Upgrades: Tilt | Front Sway Bar | Radio | Sliding Window | Bed Spare w/Lock Bed Rails | Full LEDs | Courtesy Lights | Tachometer | Glovebox Lock & Light | Head Light Relays | *Upgraded Fully Super Trim |
![]() |
![]() |
![]() |
#9 |
Senior Member
![]() Join Date: Oct 2010
Location: Cadiz, Ky
Posts: 512
|
Re: Crankcase Breather?
Rich, I think those oil filler tubes were only stock on the C-50 and C-60 trucks.
__________________
1972 Chevy LWB Roadster 1999 Chevy Silverado 2wd 2015 Chevy High Country 4x4 Crew Cab |
![]() |
![]() |
![]() |
#10 |
Mr. Cheyenne
![]() Join Date: Jun 2020
Location: Kyle, Texas
Posts: 1,688
|
Re: Crankcase Breather?
So the OP got it as an option?? - his doesn't look like a C50/60 - I am not even sure I seen anything above a C30!
__________________
Richard '72 Chevy C10 Cheyenne *Super WHT/MED BRONZE/WHT SBC 350 | TH350 | LWB | AC | Buddy Seats Upgrades: Tilt | Front Sway Bar | Radio | Sliding Window | Bed Spare w/Lock Bed Rails | Full LEDs | Courtesy Lights | Tachometer | Glovebox Lock & Light | Head Light Relays | *Upgraded Fully Super Trim |
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Sep 2011
Location: Jacksonville, FL
Posts: 143
|
Re: Crankcase Breather?
As far as I can determine from date codes, this truck is 100% stock, and the engine is original. The filler tube looks same age as rest of engine, so I really don't know...
__________________
1972 Cheyenne Super LWB, 350V8, AC, PS, PB, all original 46k survivor |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
|
Re: Crankcase Breather?
It is all factory. It works both ways. At idle or cruising with high vacuum it passes air into the engine to fill the void from the PCV valve. At heavy throttle & little or no vacuum the blowby gasses pass through this tube into the air stream.
George |
![]() |
![]() |
![]() |
#13 |
Registered User
![]() Join Date: Aug 2020
Location: Mount Pleasant Iowa
Posts: 303
|
Re: Crankcase Breather?
All stock. Have pics but of course can't find the one I want at the moment showing that setup. On a '71 C10 Custom. 350, Rochester 4bbl. Oil fill tube on the drivers side with the bracket that bolts onto the intake side of the valve cover. Passenger side flame arrestor and tube into the spacer under the air cleaner.
Truck is a bone stock farm truck that hasn't been messed with. Sitting in a shed for 10 years... The usual story, don't want to sell it, the grandkids are going to restore it. That was three years ago and it is still sitting there, untouched. |
![]() |
![]() |
![]() |
#14 | |
Registered User
Join Date: Mar 2020
Location: Portland, OR
Posts: 335
|
Re: Crankcase Breather?
Quote:
Moral of the story for the grandpas and grandmas, make a plan, write it down, talk with your family before it's too late, and think about not waiting. My grandmother made an effort to find out what her kids valued, and then was able to share a memory and gift the item. This made it more than just "valuable stuff". Last edited by SkidmoreGarage; 02-28-2021 at 09:47 PM. |
|
![]() |
![]() |
![]() |
#15 |
Registered User
Join Date: Apr 2009
Location: newbury new hampsire
Posts: 2,067
|
Re: Crankcase Breather?
That fancy oil tube came with ac only trucks o
|
![]() |
![]() |
![]() |
#16 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
|
Re: Crankcase Breather?
For what years? My '69 C20 with 350 and A/C has never had one. Based on junkyard observations, I was thinking it may have been a 71/72 addition. Maybe this subject would benefit from a separate thread.
__________________
Jim |
![]() |
![]() |
![]() |
#17 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,083
|
Re: Crankcase Breather?
The oil fill tube was stock on K model trucks. I'm not sure on the years, but my 72 K10 came with it.....
__________________
"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
![]() |
![]() |
![]() |
#18 | |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
|
Re: Crankcase Breather?
Quote:
|
|
![]() |
![]() |
![]() |
#19 |
Carpe manana
![]() ![]() Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,372
|
Re: Crankcase Breather?
These oil filler extensions accompany NOS power brake units so it may be related to power brakes. Also, these are present with AC if I’m not mistaken. As an aside, the rubber plug was originally painted with the motor. The extensions were added on after motor assembly/paint.
__________________
1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 ![]() |
![]() |
![]() |
![]() |
Bookmarks |
|
|