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Exhaust redo

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  • #16
    Looks like it would increase back pressure significantly. Guessing not too much as they were presumably produced and sold in larger numbers....
    C Rhodes
    26' Mackinaw - 1990
    351 Indmar (1990-2006: Great Engine)
    351 PCM (2006 - Current)
    Southport, NC

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    • #17
      Jerry,

      an old thread which may be of help for some ideas...
      http://www.shamrockboatownersclub.co...s-quiet.35202/
      Karen
      Punxsutawney, Pennsylvania
      1986 Shamrock H/T with RWC 330 hp PCM, dual hydraulic helm
      1992 Mako 211CC w/Mercury Optimax 175
      3 other smaller OB boats and a trusty old canoe...

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