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New exhaust elbows

Discussion in 'General Maintenance/Repair Questions' started by duckmnn, Aug 6, 2020.

  1. duckmnn

    duckmnn Member

    Jul 21, 2010
    Grafton IL where the IL and Mississippi rivers com
    270sundancer 1996
    454 B3
    So I got an updated set elbows that replace the old style on my 96 7.4 .Mercruiser tech gave me part number . Problem is my boat use 3 inch riser block between elbows and manifold . Plus old was fastened with studs . New one are about 6” bolts . But bolts need to be about 10” to use riser blocks ?? Any ideas ? Thanks
  2. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Order 10" bolts from Fastenal or Merc. 3/8" course thread
  3. rcknecht

    rcknecht Well-Known Member

    Mar 23, 2009
    toms river,nj
    340 Sundancer 2001
    T 454 MPI
    replace the manifold risers and elbows together.

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