Thread sizes

Discussion in 'Engine Topic' started by KHE, Apr 20, 2016.

  1. KHE

    KHE New Member

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    Hi everyone. Can someone please tell me what thread sizes are used for the intake bolts, water pump bolts, power steering bolts, and alternator bolts? I have a 70s 350 factory block
     
  2. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

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    All those are 3/8-16
     
  3. 77 cruiser

    77 cruiser Veteran Member

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    Don't use too long of bolts for the intake, a couple of them will hit the pushrods.
     
  4. KHE

    KHE New Member

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    Thanks once again. NastyZ28 is the best forum ever.

    Does anyone know what tap to use on the valve cover bolts?

    Getting closer. Will post progress on the project shortly
     
  5. 81BirdMan

    81BirdMan Veteran Member

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    Are you re-threading or just cleaning ("chasing") the valve cover bolt holes?

    http://www.hotrodders.com/forum/thread-chaser-vs-tap-163154.html

    http://www.route66hotrodhigh.com/SBC-Bolts.html

    Item Description Size Qty

    1. Intake Manifold 3/8-16 x 1" 12
    2. Valve Covers (Pre-82) 1/2-20 x 3/4" 8
    3. Oil Pan 1/4-20 x 1/2" 14
    4. Oil Pan 5/16-18 x 3/4" 4
    5. Flywheel flex-plate 7/16-20 x 11/16" (3/4") ?
    6. Timing Cover 1/4-20 x 1/2" 10
    7. Torque Converter 3/8-24 x 1/2" 3
    8. Fuel pump 3/8-16 x 1 1/4" 2
    9. Thermostat housing 3/8-16 x 1" 2
    10. Carburetor 5/16-18 x 1 1/2" 4
    11. Water pump (have to measure them) 4
     
  6. fatkid_racing

    fatkid_racing Veteran Member Lifetime Gold Member

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    I think the size listed for valve covers is incorrect, I've never seen an 1/2" valve cover bolt.
     

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