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Technical Water Pump Dilemma

Discussion in 'The Hokey Ass Message Board' started by MrPhat40, Nov 28, 2018.

  1. MrPhat40
    Joined: Apr 30, 2007
    Posts: 91

    MrPhat40
    Member

    Dear H.A.M.B.er's

    Just received my new Stewart Stage 2 pump Model # 22301 for my mildly tuned 327 SBC (circa 1965). I bought the aluminum pump as I thought it to be the best way to go and not have to worry about a water pump for the long haul.
    In doing the dry fir I noticed this pump does not have a water bypass (small open port on the passenger side of the water inlet).

    Stewart says that this by pass is not used on their high performance Stage 2 unit.

    So the question is: do I need a bypass for usual street driving/cruising?
    What are the downsides (if any) for using this pump on the street?

    Appreciate the expertise this group always offers.

    MrPhat40
     
  2. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,957

    Johnny Gee
    Member
    from Downey, Ca

    Do you have a heater in the car? Does it flow all the time?
     
    29AVEE8 likes this.
  3. jaw22w
    Joined: Mar 2, 2013
    Posts: 1,490

    jaw22w
    Member
    from Indiana

    I have never run one on any of my many sbc's. Never a problem. Heater or no. Maybe I've been lucky for 50 years.
     
  4. Mr48chev
    Joined: Dec 28, 2007
    Posts: 31,031

    Mr48chev
    ALLIANCE MEMBER

    Stage 2 pump shows to have the theaded hole for the heater hose connection in this shot https://www.summitracing.com/parts/emp-22103/overview/ What it doesn't have is the normally plugged outside of some truck applications bypass connection on top.
    Most stock 327 iron pumps I have seen come with the bypass hole on top and with a plug in it. I don't think in the past 55 years I have ever hooked up a bypass hose to one. Like this one if the O'Reilly's link works. https://www.oreillyauto.com/detail/...6144/1964/chevrolet/impala?q=Water+Pump&pos=1
     

  5. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,957

    Johnny Gee
    Member
    from Downey, Ca

    Drill it or exchange it.
    [​IMG]
     
  6. MrPhat40
    Joined: Apr 30, 2007
    Posts: 91

    MrPhat40
    Member

    Actually I was referring to the by pass hole as shown in the picture posted by Johnny Gee.
    Do I need this opening for a street car with a heater?



    Sent from my iPhone using The H.A.M.B. mobile app
     
  7. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,957

    Johnny Gee
    Member
    from Downey, Ca

    It helps by giving water a chance to move when thermostat is closed (cold). In 55 the first year of SBC some vehicles came with out heaters so this by pass was done.
     
  8. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,957

    Johnny Gee
    Member
    from Downey, Ca

    Does your system have full flow of coolant or does it have a heater valve?
     
  9. derpr
    Joined: Mar 11, 2007
    Posts: 257

    derpr
    Member

    Are you using a thermostat?
    I would drill a 3/16 hole in the thermostat. Creating my own bypass.


    Sent from my iPhone using The H.A.M.B. mobile app
     
    Rich S. and VANDENPLAS like this.
  10. MrPhat40
    Joined: Apr 30, 2007
    Posts: 91

    MrPhat40
    Member

    The thermostat is a 180 degree high performance model from Speedway it features (3) 3/16th inch bypass holes.
    So it looks like I will be okay with this unit.

    My concerns are all due to the fact I need to trim the driver side mount to get it to clear the timing cover.
    If I grind this pump in order to fit it I own it!!

    Appreciate the explanation of the bypass.
    MrPhat40



    Sent from my iPhone using The H.A.M.B. mobile app
     
  11. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,957

    Johnny Gee
    Member
    from Downey, Ca

    Reminds me of the time my Dad went to White Front to buy shoes and come home with a stereo unit instead. :)
     
    Rich S. likes this.
  12. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 28,801

    Jalopy Joker
    Member

    what long haul? aluminum corrodes too, unless running a clean sacrificial anode
     
  13. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,911

    dirty old man
    Member Emeritus

    Where to get and how to install sacrificial anode? I'd like to install one in each of the cars I have with aluminum components in the cooling system.
    As for the bypass, my sbc powered '31"A" Hiboy utilizes a Zip's water pump riser which omits the oem bypass hole and the instructions that came with it were very emphatic about the necessity of a bypass hose if there wasn't a heater with constant flow on the car. The hose runs from an outlet on the pass side head to the nipple cast into the water pump housing.
     
  14. MrPhat40
    Joined: Apr 30, 2007
    Posts: 91

    MrPhat40
    Member

    Great point
    At this point in time I am returning the Aluminum Stewart for credit
    Looking into their cast iron unit.
    Appreciate your comments
    MrPhat40



    Sent from my iPhone using The H.A.M.B. mobile app
     
  15. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 28,801

    Jalopy Joker
    Member

    simple install - one from Flex-A-Lite replaces radiator drain plug, Scott Drake & Northern Radiator offer radiator cap replacements
     

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