401 oversize bore question

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  • Full Size Jeeper
    304 AMC
    • Jul 20, 2014
    • 2475

    401 oversize bore question

    If my bore is 4 3/16 any idea what the bore would be?
    1978 Wagoneer

    401/turbo 400 trans. Quadra-Trac BW1339 (with Low) 4" Rusty's lift with 31" Summit Mud Dawgs

    Mods:
    Fuel Tank, Red Holley Fuel Pump, Razor Grill (profile pic out dated), Rebuilt steering box
  • babywag
    out of order
    • Jun 08, 2005
    • 10286

    #2
    Need to be more accurate.
    Engine your dealing in hundreths of inch.
    However 3/16 = .1875
    So stock = 4.165, and yours ~4.1875
    Could be .020 or .030, depending on accuracy of your measurement.
    go grab a caliper from harbor freight.
    Tony
    88 GW, 67 J3000, 07 Magnum SRT8

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    • 440sixpack
      327 Rambler
      • Jul 21, 2016
      • 612

      #3
      Measuring would be best, but if you have oversized pistons it should be stamped on top of them.

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