Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

PCV valve on 73 sbc

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chaz316, Aug 21, 2001.

  1. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    Okay I removed my factory air cleaner and all. On my passenger side valve cover there was a pie that went into the side of the air cleaner housing. I bought a new grommet and a PCV valve. Where is the hose that I am supposed to run to the PCV valve?

    The little hose that ran from the passenger side of the Q-Jet to the end of the air cleaner housing is too small to go on the PCV valve so I capped it off. There is one hose that comes out of the front of the carb that was capped by the previous owner. It comes straight out and it looks like a fitting that has another hose going off to the passenger side. Any input would be appreciated.

    I havent had time to go through my service manual yet. I figured there was a few people (quite a few Im sure) that know enough about this that could help. Thanks in advance.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  2. Burt4x4

    Burt4x4 3/4 ton status

    Joined:
    Feb 17, 2000
    Posts:
    6,854
    Likes Received:
    0
    Location:
    California (Modesto area)
    On my 72 the PCV is hooked to the very front of my carb. It's the big one in front. PCV requires full vacume sorce. the only other vacume line off my carb is for the distributer ever thing else is capped off...
    Hope this helps.
    Goto my site below and the first couple of pics is my motor you can see the PCV going to the driverside valve cover..
    Oh and the Vacume sorce for my powerbrake booster is off the rear of my intake manafold.

    <P ID="edit"><FONT class="small">Edited by Burt4x4 on 08/21/01 07:59 AM.</FONT></P>
     
  3. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    Could it be capped now? The one that comes straight out of the front of the carb on mine is capped. I may have to stop on the way home and pick up some hose.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  4. Burt4x4

    Burt4x4 3/4 ton status

    Joined:
    Feb 17, 2000
    Posts:
    6,854
    Likes Received:
    0
    Location:
    California (Modesto area)
    yup it could...
    duno what I did to that last post but took out my sig at the bottom????weired.......

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <a target="_blank" href=http://www.geocities.com/baja/5099>www.geocities.com/baja/5099</a>
     
  5. Michael

    Michael 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,576
    Likes Received:
    0
    Location:
    Sherman, Texas
    When ya go back an edit a post the html stuff gets real fouled up...not sure why...On my '74 the PCV connects to the carb right below the fuel inlet connection....it's about a 3/8" line.

    Michael[​IMG]
    <a target="_blank" href=http://www.jmartin.net/parker/goose.htm>www.jmartin.net/parker/goose.htm</a>
     
  6. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    Im glad you got the link back on there. I looked at the picture of your motor on the right. I saved a copy of it and opened it with MS Photo editor and zoomed in to about 300% the large hose coming out of the front that goes to the driver side of the engine seems to be the one on mine that is capped. Is you PCV valve on the front of your driver side valve cover?

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  7. xnoahx

    xnoahx 1/2 ton status

    Joined:
    Oct 12, 2000
    Posts:
    817
    Likes Received:
    0
    Location:
    Ventura, CA 93004
    The PCV locaton is on the driverside valve cover. the one on the passengerside valve cover you can replace with a breather if you arent running the factory air cleaner.

    Check out my 73 K5 <a target="_blank" href=http://members.theglobe.com/xnoahx/73k5.htm>http://members.theglobe.com/xnoahx/73k5.htm</a>
     
  8. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    The only vent mine has is on the passenger side. I tried to go with the little cap thing but it wouldnt fit. I got kinda ticked off at the guy at Advanced Auto because he gave me one and "Guaranteed" it would work. The driver side only has the oil cap. The engine is all original as far as I know.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  9. Executioner

    Executioner 1/2 ton status

    Joined:
    Feb 22, 2000
    Posts:
    1,530
    Likes Received:
    0
    Location:
    Temp. Ft. Walton Beach Fl. home=Tucson, Az.
    On my 73 the drivers side valve cover was the PCV , and I have also seen over 50, 73 Blazers with it on the drivers
    side.
    Usually on the passenger side valve cover is the Air cleaner breather filter.
    Good luck
     
  10. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    The grommet fit and the pcv valve went in like a champ. The guy at advanced had a 71 Malibu and we popped the hood and his pcv valve was on the passenger side also. I'll check it out when I get off of work to make sure. None of the cleaners I tried would fit not 1" not 11/4" they were all too big.

    I'll post later this evening.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  11. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    Oh one more thing. Did the other 73 Blazers have factory air? Mine has air and it is on the driver side. I dont know if that would make any difference or not.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  12. Executioner

    Executioner 1/2 ton status

    Joined:
    Feb 22, 2000
    Posts:
    1,530
    Likes Received:
    0
    Location:
    Temp. Ft. Walton Beach Fl. home=Tucson, Az.
    Most of them did not have factory air. I think if you can find a shop manuel and the underhood sticker that shows
    the vaccum line routing, that might provide some good clues, as to which side the PCV was on from the GM Factory, but it may not make that much difference.
    Back in 73 I also saw some light duty, and some heavy duty rating for the Emmission Systems,
    also GVW rating came into play.
     
  13. Chaz316

    Chaz316 1/2 ton status

    Joined:
    Jul 25, 2001
    Posts:
    224
    Likes Received:
    0
    Location:
    Georgia
    Okay, The capped hose on the front of the carb was creating vacuum(sucking air in) when I uncapped it the RPMs went up and then down again when I put the cap back on. So I ran a new hose to the newly installed pcv valve. I took it for a test drive and, dont laugh, I swear it had more torque. When I barely hit the gas it just took off. I drove it for about 20 minutes to let it warm up and then I turned the air on and off to make sure there wouldnt be any problems running it.

    It seems to be doing okay and I'll test it a little more tomorrow.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     

Share This Page