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    454 Magnum Upgrades
    #1
    Charter Member Tommy Gun's Avatar
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    I have an stock Merc 454 magnum EFI 385 HP in my 1995 Cig 20.

    It is time to upgrade the motor/headers. Whats out there? Any recommendations? Whipple it?
    Warning: There will be no warning shots.
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    #2
    Founding Member Wrinkleface's Avatar
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    Sterling 1500!!!
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    #3
    Charter Member Tommy Gun's Avatar
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    I want to upgrade the motor not replace it...
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    #4
    Jc Performance got 515hp out of mine with the stock heads & intake. He just used a 525 cam, ported the heads & a good program of the efi.
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    #5
    Registered Trim'd Up's Avatar
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    Quote Originally Posted by Tommy Gun View Post
    I want to upgrade the motor not replace it...
    That's a shame. I have a 711 hp 548 that sure would make it fly.

    How much power are you looking to get?
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    #6
    do the heads and cam bigger prop
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    #7
    Charter Member Tommy Gun's Avatar
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    Quote Originally Posted by Trim'd Up View Post
    That's a shame. I have a 711 hp 548 that sure would make it fly.

    How much power are you looking to get?
    Much as I reasonably can out of this rebuild.

    Has Bravo 3.
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    #8
    Charter Member mikes280's Avatar
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    bore it 60 put a 4.25 crank in it touch up the heads add a crane 741 and you have a 496 that can make up to 600hp
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    #9
    How fast is that boat with the stock motor now?
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    #10
    Charter Member Tommy Gun's Avatar
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    Quote Originally Posted by JupiterSunsation View Post
    How fast is that boat with the stock motor now?
    68
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    #11
    Are you sticking with the Bravo III after the rebuild or going to a Bravo I? That decision should influence how far you want to go HP-wise with this upgrade.
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    #12
    Put a Black Hawk on it and gain mph for cheap
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    #13
    Charter Member Tommy Gun's Avatar
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    Quote Originally Posted by Knot 4 Me View Post
    Are you sticking with the Bravo III after the rebuild or going to a Bravo I? That decision should influence how far you want to go HP-wise with this upgrade.
    Going to try it with a Bravo 1 lower...we'll see.
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    #14
    Charter Member Tommy Gun's Avatar
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    Quote Originally Posted by Airpacker View Post
    Put a Black Hawk on it and gain mph for cheap
    Blackhawks have their own set of issues (shifting), but I have considered an Arneson as it would appear that it would produce he desired result and decent dockside manners.
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    #15
    Quote Originally Posted by Tommy Gun View Post
    Blackhawks have their own set of issues (shifting), but I have considered an Arneson as it would appear that it would produce he desired result and decent dockside manners.
    What shifting issues? never had a single shifting issue in 5 summers of running one behind an efi motor.
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    #16
    Tommy Gun , I have a M1 procharger for your motor, keep everything alone and enjoy great cruise speeds without going into boost.
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    #17
    Tommy, I'm really happy with what I did to my 454's. If you want the cam specs & stuff like that, PM me.
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    #18
    Charter Member Tommy Gun's Avatar
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    Quote Originally Posted by Airpacker View Post
    What shifting issues? never had a single shifting issue in 5 summers of running one behind an efi motor.
    I have been told they have problems with higher HP and have to be shifted like a crash box????.
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    #19
    I think the first question a builder would ask is if you want to keep the EFI system.
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    #20
    Registered Slandrew's Avatar
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    Quote Originally Posted by Bill N View Post
    Jc Performance got 515hp out of mine with the stock heads & intake. He just used a 525 cam, ported the heads & a good program of the efi.
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