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  1. #21
    Junior Member
    Join Date
    Dec 2012
    Location
    California
    Posts
    3

    black
    1991 GMC Sierra

    Hate being wrong, but I was. Here is actual proof on the direction of flow. I replaced the water pump so before I put it all back together I installed a thermostat housing without the thermostat, a couple of hoses, pinched of the heater hoses, and put some water in the hoses. Here is the result.

  2. #22
    Senior Member Cutlass's Avatar
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    7,006

    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    thank you for that!
    -------------------------------------
    Kooks 1 7/8" race headers, Kooks ORY, Borla catback, Nitto 555R, LS6 intake manifold, Shaner S3 ported stock throttle body, SLP lid, smooth bellows, JAAM Ram Air kit, Elite Engineering catch can, LS6 valley cover, EGR and AIR deleted, Frost tune, and Simpson Racing child car seat in the back. 13.2 @ 108MPH

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