'70 SBC 4-bolt main block usage - NCRS Discussion Boards

'70 SBC 4-bolt main block usage

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  • Bill B.
    Very Frequent User
    • August 1, 2016
    • 303

    '70 SBC 4-bolt main block usage

    Hi everyone,

    I figured that someone on this board would be able to substantiate or refute the long-held rumor I heard of that 1970 model year SBC (350) 4-bolt main blocks being installed in all Chev pass vehicles that year. I know that my original July build '70 Corvette base engine (350/300) was a 3970010 block with "010" and "020" cast marking behind the flywheel area and in the timing chain area, which I have heard depicted a high nickel content. Yes, it was a 4-bolt main. I wasn't expecting my base engine to be a 4-bolt, but that's when the I heard the rumor mill indicating even the Impala had 4-bolt blocks that year.

    Can anyone elaborate on this? Just curious ...
    Bill Bertelli
    Northeast and Carolinas Chapters Member
    '70 Resto Mod LT-1 w/ partial '70 ZR-1 drivetrain
  • Patrick B.
    Extremely Frequent Poster
    • August 31, 1985
    • 1995

    #2

    Comment

    • Larry E.
      Extremely Frequent Poster
      • December 1, 1989
      • 1673

      #3
      Re: '70 SBC 4-bolt main block usage

      The 3970010 block has to be one of the longest running (If not THE longest) running blocks available from Chevrolet.
      Bought brand new a 1977 Chevy Sport P/U with the LS9 and the 4 Bolt Block was the 3970010. IIRC it was that block
      for the 70 Z28 also. Picture below of the 77 Sport Engine. Still have it and is For Sale. Thanks Larry
      Attached Files
      Larry

      LT1 in a 1LE -- One of 134

      Comment

      • Edward J.
        Extremely Frequent Poster
        • September 15, 2008
        • 6940

        #4
        Re: '70 SBC 4-bolt main block usage

        Originally posted by Larry Evoskis (16324)
        The 3970010 block has to be one of the longest running (If not THE longest) running blocks available from Chevrolet.
        Bought brand new a 1977 Chevy Sport P/U with the LS9 and the 4 Bolt Block was the 3970010. IIRC it was that block
        for the 70 Z28 also. Picture below of the 77 Sport Engine. Still have it and is For Sale. Thanks Larry
        Larry, would love to see a few pic.s of the 77 chev.
        New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

        Comment

        • Larry E.
          Extremely Frequent Poster
          • December 1, 1989
          • 1673

          #5
          Re: '70 SBC 4-bolt main block usage

          Originally posted by Edward Johnson (49497)
          Larry, would love to see a few pic.s of the 77 chev.

          Edward>Thanks for the interest. Look up Hemmings Ad #2403978.(Many Pictures) You will see a lot of similarities
          to the 77 Corvette (Engine). Larry
          Larry

          LT1 in a 1LE -- One of 134

          Comment

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