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Thread: Vacuum pump

  1. #1
    Senior Member MASTER BUILDER
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    Vacuum pump

    I just put a Moroso vacuum pump on my 598 BBC and was wondering if I could connect the pump intake to my existing breather caps. The valve covers are chrome and I am worried about damaging them if I drill new holes for the intake. Has anyone drilled chrome plate before and had success?
    The pump intake line is #12 and the outlet on the breather caps is #8.

  2. #2
    Senior Member RACING JUNKIE fla1976's Avatar
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    There are breather made that already are designed for that purpose.
    Is this what you need. The items below the breather clamps.

    http://www.jegs.com/i/CSR/170/680/10002/-1

  3. #3
    Senior Member MASTER BUILDER
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    I already have breathers on the valve covers. They were tied in to my headers for evacuation before. The outlet on the breather is #8 AN and I would like to tie the intake line from the vacuum pump into these fittings. Can I do it? If so, do I need to tie into one or both?

  4. #4
    Senior Member RACING JUNKIE fla1976's Avatar
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    If it already has a #8 AN fitting, it is easy to plumb it to a pump. What fitting is on the pump. More than likely it is straight pipe. Any decent hardware store will have the fittings,except the AN. The AN can be picked up at a local speed shop or call Ron Owens and he can probably set you up.

    http://ronowensracing.com

  5. #5
    Senior Member RACING JUNKIE
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    Re: Vacuum pump

    Quote Originally Posted by kod99
    I just put a Moroso vacuum pump on my 598 BBC and was wondering if I could connect the pump intake to my existing breather caps. The valve covers are chrome and I am worried about damaging them if I drill new holes for the intake. Has anyone drilled chrome plate before and had success?
    The pump intake line is #12 and the outlet on the breather caps is #8.
    Easy fix, get a big enough drill bit and put duct tape on both sides of the hole and redrill it bigger. I've done this more then once on chrome.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  6. #6
    Senior Member MASTER BUILDER
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    x2 Drill it. You only need to be tapped into one valve cover. Plug the other one.
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!

  7. #7
    Junior Member JOURNEYMAN
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    you will also need a relief valve on the valve cover if you are not using one on the suck fitting

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by al34
    you will also need a relief valve on the valve cover if you are not using one on the suck fitting
    thats not 100% true. You may or may not. depending on the pump, pulley sizes you run.


    This is what you need in your valve cover, but be sure the rockers are not close to hitting on the bottom.
    http://www.jegs.com/i/Moroso/710/22635/10002/-1
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  9. #9
    Senior Member MASTER BUILDER
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    Thanks for the help guys! It's good to know that if I have to, I can drill the valve covers without damaging the chrome, David.

    I would still like to know if I would get enough suction to the pump by routing the suction line to the two #8 AN fittings on the breather caps? Has anyone done it this way?

    I have a Moroso relief valve that screws into the pump.

    Here is a pic of how the breathers are set up now for header evacuation.


  10. #10
    Senior Member RACING JUNKIE
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    I have a buddy who just tapped the top of the breather and put a 12an fitting in the top of it and capped the side. If it were me, id just drill the valve cover out it'll look much better.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com


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