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454 Magnum

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  • 454 Magnum

    I'm researching different types of long blocks for my Wellcraft. I have 1995 Gen V 7.4L in their now. I have been looking at US Engine at their website about 454 Magnum motors with 2" rectangular ports that have 55 more hp and torque in the 1500 to 4000 rpm range and use 20% less fuel than the original mercs. I have a Magnum in my other boat and I love that engine and it's performance. My question is will this in any way affect the Hurth transmissions I have in my boat and will I have to reprop as well? Any advice would be appreciated.

  • #2
    Re: 454 Magnum

    First I don't believe their claims about horsepower and especially efficiency. Otto cycle technology (throttle and spark plugs) just doesn't support efficiency swings like that. If they are that good they should be building engines for GM

    What model Hurth? Specs? What hp rating in there now? Carbed 310?
    Torque gets you there. Horsepower gets you there in time for dinner.

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    • #3
      Re: 454 Magnum

      They are Hurth HSW630V1-1.55 Gear C. That's all the information I can find on them. The motors are 310hp I believe and are carbed.

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      • #4
        Re: 454 Magnum

        That's one sweet motor but I would need two and a much larger cheeckbook!!

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        • #5
          Re: 454 Magnum

          Looks like they'll be fine: http://www.simplicity-marine.com/ZF/.../Technical.htm

          I am getting 1.56 ratio though. Not sure why.
          Torque gets you there. Horsepower gets you there in time for dinner.

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          • #6
            Sign up today
            Re: 454 Magnum

            Thanks for the info QC it may not be as expensive as I thought!! HA HA!

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