Big Block Water Pump Housing....440Source vs Mancini

Discussion in 'Big Block A body Tech' started by Jlcaptain24, Sep 14, 2018 at 9:20 AM.

  1. Jlcaptain24

    Jlcaptain24 Well-Known Member

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    Posting for info only and to help others.

    I've fought high temps on my 440 dart since day 1. I'm blowing it all apart and redoing everything regarding cooling. Water pump/housing, radiator, fans...all new.

    There's been lots of talk regarding casting on the 440source water pump housings having smaller passages. Supposedly a manufacturing flaw that was corrected. I bought mine maybe 2-3 years ago. AFTER all the drama was fixed.

    Well...hard to measure, but I can tell you without a doubt there passages are smaller than the Mancini Pump Housing. in the 440 source passages my finger can barely wiggle. In the Mancini one...I have at least 3/16-1/4" wiggle room. Doesn't sound like much...but I think it's notable.

    Also feel like the 440source water pump design isn't helping things.

    Anyway...just info for the masses to help others make decisions.

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    • mopar505

      mopar505 FABO Gold Member FABO Gold Member

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      dont forget about your pump pulley to crank ratio.
       
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      • Dfr360cuda

        Dfr360cuda Well-Known Member

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        So, is one of them a rebuilt core ?
        The restrictive one will probably also need more horsepower to turn, or current for an electric pump.
         
      • Jlcaptain24

        Jlcaptain24 Well-Known Member

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        Factory pulley. There’s probably multiple diameters
         
      • jos51700

        jos51700 Well-Known Member

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        Fingerbang_a62d87_520705.jpg Fingerbang, bang you, bang bang bang!
         
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        • mopar505

          mopar505 FABO Gold Member FABO Gold Member

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          there is and you want one smaller than the crank. just went thru this cooling not so cool
           
        • oldkimmer

          oldkimmer Well-Known Member

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          I run the source housing and pump and don’t have a problem. 1974 duster with factory 2 core 26 inch rad. No shroud. Declutching 7 blade fan. 470 stroker with the block half full of hard block. Just saying. Kim
           
        • jos51700

          jos51700 Well-Known Member

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          Given the likelihood of aluminum corrosion on a mixed-metal engine, I'd run the thicker-walled casting and find the real problem in a New York Minute.

          As in, that one with the thinner hose spigot would already be on the classified page and I'd port the motor-side where there's plenty o beef.
           
        • famous bob

          famous bob mopar misfit

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          I drove mine again yesterday , got up to 198 , was only about 90* tho.
          I bought mu alum pump housing off ebay, and checked it against the orig. 440 Chrysler pump, didn`t take much to clean it up and make the passages bigger---------
           
        • Jlcaptain24

          Jlcaptain24 Well-Known Member

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          Saskatchewan vs. Texas 110 deg in Traffic. Just saying. LOL
           
        • oldkimmer

          oldkimmer Well-Known Member

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          This is in 34-36 degree Celsius days, which is 93.2 f and 96.8 f. So pretty close to Texas I would think. Kim
           
        • DartSwinger451

          DartSwinger451 Well-Known Member

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          I had the exact same experience on my 451. The 440source housing was marginal at best. The Mancini housing made a big difference in reducing the temps. No other changes made to the rest of the cooling system.
           
        • threewood

          threewood Well-Known Member

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          Here is a stock iron housing vs. an Ebay aluminum housing. Mopar shops want way too much for a stupid housing and I bet they are all pretty much the same. For the pump, I don't trust the cast impeller design. The stamped is what was used by the factory.

          I'm running a .040" over 440 in Yuma, driving in 107 degree temps without an issue. 6 blade fan, thermal clutch, 26" radiator, fan shroud. Sitting in traffic at these temps it goes to 200 degrees, driving is solid at 195 degrees.
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        • 5.7 hemi

          5.7 hemi FABO Gold Member FABO Gold Member

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          Before I would change the housing, I’d get a Flowkooler water pump. They work, hands down the best out there.