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Thread: Bolts for dual thermostat housing

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  1. #1
    Join Date
    Dec 2010
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    SE Texas
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    Default Bolts for dual thermostat housing

    Does anyone know the part number or specific size of the 4 bolts that hold the water outlet to the dual thermostat crossover manifold? Have searched this forum and the internet and cannot find them. Also, is there a gasket between the two or just the 2 t-stat seals? Thanks.
    '95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, VIN F, L65, 120K. Mods: DE 4" exhaust/crossover, WW2, PMD relocate, Dmax fan/clutch, HP air filter, Fluidampr, B&M Trans/Diff covers.

  2. #2
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  3. #3
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    Default gaskets

    Quote Originally Posted by More Power View Post
    The bolts are metric... 1.5mm thread pitch x 10mm in diameter, length to suit. It's been a while since I've dealt with a dual stat housing... Jim
    Could you comment on gaskets.....from what I see on these complete kits, it looks like there are several o-rings but no gaskets, except for where the crossover mounts to the block. Am trying to order parts separately to make my own kit to convert my 1995 to a 1997 cooling system. Thanks for the bolt info.
    '95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, VIN F, L65, 120K. Mods: DE 4" exhaust/crossover, WW2, PMD relocate, Dmax fan/clutch, HP air filter, Fluidampr, B&M Trans/Diff covers.

  4. #4
    Join Date
    Oct 2001
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    Granby, Missouri, USA
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    3,081

    Default

    There are the just two rubber gaskets used around each thermostat. No other gaskets.

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter

  5. #5
    Join Date
    Dec 2010
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    SE Texas
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    66

    Default

    Quote Originally Posted by arveetek View Post
    There are the just two rubber gaskets used around each thermostat. No other gaskets.

    Casey
    Ya know that's what I thought but wanted to be sure. Thanks for the input.
    '95 GMC Sierra 6.5TD C2500, reg cab, long box, 2x4, 4L80E, 3.73 ratio, VIN F, L65, 120K. Mods: DE 4" exhaust/crossover, WW2, PMD relocate, Dmax fan/clutch, HP air filter, Fluidampr, B&M Trans/Diff covers.

  6. #6
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    The seals with the thermostats are effective. If the housing leaks, it's likely due to crack(s), or porosity in the casting. Almost never does gaskets or RTV cure that. Use minimal recommended bolt torque, and blue thread locker. This prevents warpage and cracks.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

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