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Big Block chev distance from rear block face to flywheel flange on crankshaft?

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  • Big Block chev distance from rear block face to flywheel flange on crankshaft?

    Hi, does anyone have a BBC laying around who could measure the distance from the rear of the block (the face that the bellhousing bolts to) to the rear flange of the crankshaft (the surface that the flywheel bolts to? I'm working on designing a custom crank for a Lincoln 337, but it is going to have chevy stuff on the front and back. Thanks, Joel
    Last edited by Hemi Joel; January 27, 2021, 08:13 PM.

  • #2
    I do, but it's at my old house, and I'm at the new one.

    The small block and big block are the same, also the same as the four and six engines. Although the crank flange changed when they went to a one piece seal, 1986 on small blocks, early 90s on big blocks, I think.



    My fabulous web page

    "If it don't go, chrome it!" --Stroker McGurk

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    • #3
      lemme grab a caliper, or find a caliper, I got one on a stand now.


      getting between .7118 to .7215 as I rotate the crank around measuring at the same point when it clears, so guessing my face is somewhat off. It was .205 between the back of the crank face to the rear of the block consistently.

      Should get you in the ballpark.
      Last edited by anotheridiot; January 28, 2021, 08:04 AM.

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      • #4
        Thanks! Just to make sure, does the crank stick out .205" from the block face, or is it recessed .205 into the block.

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        • #5
          sticks out about 3/4 inch.

          Click image for larger version

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          My fabulous web page

          "If it don't go, chrome it!" --Stroker McGurk

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          • #6
            Originally posted by Hemi Joel View Post
            Thanks! Just to make sure, does the crank stick out .205" from the block face, or is it recessed .205 into the block.
            .205 between the rear of the block and the rear of the crank face.

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            • #7
              OK, got it! thanks much.

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              • #8
                Originally posted by Hemi Joel View Post
                OK, got it! thanks much.
                I just added that because it was a more consistent measurement than the face you are looking for.

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                • #9
                  What is different if I use a one piece seal?

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