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Thread: Mercury Mark 58, Why The Preferences?

  1. #21
    John (Taylor) Gabrowski
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    Default Interesting, Put it wrong a bit wrong actually

    I had to go back and look at the records of the kafufull all over again from the 1970s. My notes from stock years put the electric start Mark 55Es port timing above the Mark 55s and within .005 inches next to the Mark 55H. In inspections the Mark 55Es porting was comparable to Mark 55Hs. Fully half of the Mark 55H blocks here supplied by Merc as replacement blocks for D-Stocks were Mark 55Es. They were all legal and competitive with 55Hs and 55H-1s.

    I really must be more precise for some of you, do I?

    Of course, especially those with very plain agendas.

  2. #22
    Sam Cullis Mark75H's Avatar
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    Nov 2004
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    Default

    There is no separate part number for 55 & 55E blocks
    Since 1925, about 150 different racing outboards have been made.


  3. #23
    Team Member crankbearing's Avatar
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    Dec 2004
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    Default I stand corrected

    I was at Ron's on the weekend pickup some more stuff to liquidate on Ebay for Dort and I picked up what I thought to be a 35A block but when I looked at the ports I wondered, so looked up the serial number on the block and it is in the 59 55H serial # group.. but the label on side says full jewelled thunderbolt not just "THUNDERBOLT" and it has the bolt holes on bottom for the first bolt on tuner which is new to me for that style of block compared to the early 500.. interesting what you discover.. I also found a couple 55H blocks one mod and one stocker both built by Kurtz (spelling)

    It is wild the things you discover about this stuff..

    but the real neat thing is in reading the list of serial group numbers for

    56-57 there were only 1000 55H's made and in 59 only 310.

    Regards,
    Dave Scott
    Ottawa, Canada
    Need Race Parts - http://stores.ebay.com/Aim-Outboard-Recyclers
    www.aimoutboards.com

    20-CE DSH
    20-CE DMH

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