Help me choose 6 or 8 bolt small block crankshaft?

Daytona - Superbird Forum

Moper 305 crankshaft profile recommended?

Poll closed Jun 23, 2017.
  1. 6 bolt

    0 vote(s)
    0.0%
  2. 8 bolt

    0 vote(s)
    0.0%
  3. Doesn't really matter

    100.0%
  1. Dibbons

    Dibbons Well-Known Member

    Messages:
    1,065
    Likes Received:
    323
    Joined:
    Nov 29, 2014
    Location:
    La Paz, B.C.S., Mexico
    Local Time:
    2:54 PM
    My Super Satellite project ('72 Plymouth Satellite Sebring Plus conversion to Superbird/Supersatellite) needs a 305 Mopar motor before I fabricate the wing and nose. Can't find a 1970 Trans AM Mopar 305 crankshaft so I will just have to have the 2.96 stroke crankshaft special ordered. Wonder whether I should specify a 6 or 8 bolt configuration, will be using 904 automatic. Thank you.
     
  2. rumblefish360

    rumblefish360 Well-Known Member

    My Photo Garage
    Messages:
    2,605
    Likes Received:
    568
    Joined:
    Jun 30, 2008
    Location:
    Long Island, New York
    Local Time:
    3:54 PM
    You can get a B&M flex plate for ether.
     
    • Thanks! Thanks! x 1
    • 66Satellite47

      66Satellite47 Well-Known Member

      Messages:
      1,899
      Likes Received:
      1121
      Joined:
      Jan 15, 2015
      Location:
      St Paul MN
      Local Time:
      3:54 PM
      Six bolts seem to hold up to lots of torque & power. Just use good bolts. LOL
       
      • Agree Agree x 2
      • Hemirunner

        Hemirunner Well-Known Member

        Messages:
        2,615
        Likes Received:
        1926
        Joined:
        Jul 12, 2011
        Location:
        Down South
        Local Time:
        3:54 PM
        With that stroke, it isn't going to make enough torque to stress either. I'd be looking for good heads and a 5.13 gear so you can get enough rpm to make any power.
         
        • Agree Agree x 1
        • 66Satellite47

          66Satellite47 Well-Known Member

          Messages:
          1,899
          Likes Received:
          1121
          Joined:
          Jan 15, 2015
          Location:
          St Paul MN
          Local Time:
          3:54 PM
          BTW I've had several 440 + motors at about 600 HP with 6 bolt cranks. The six bolts were never the problem, just the factory crank and my excessive RPM.