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?
Thread: 454 Magnum Upgrades
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04-06-2010 07:08 PMWarning: There will be no warning shots.
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04-06-2010 07:11 PM
Sterling 1500!!!
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04-06-2010 07:12 PM
I want to upgrade the motor not replace it...
Warning: There will be no warning shots.
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04-06-2010 07:19 PM
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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04-06-2010 08:43 PM
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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- Join Date
- Nov 2008
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04-06-2010 08:52 PMHow fast is that boat with the stock motor now?
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04-07-2010 08:30 AM
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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04-07-2010 08:43 AM
Put a Black Hawk on it and gain mph for cheap
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04-07-2010 11:39 AM
Well, now someone with some serious real world experience running one will tell you different
I ran 575 hp spinning 31's thru 1.50 gears and never had any issue. Yes, it does shift a little hard due to big props and solid bite but it always shifted. Not really any harder than a 1.34 Bravo with a big wheel on it.The efi catches the engine load and prevents stalling. I did install a neutral switch over ride so I could start it like a crash box but that was by choice. If we got stuck just floating around for a while at a poker run stop, I would just shut it off in gear and refire in gear, no waiting for the EFI to let the idle come back down.
If I didn't build a 900 for my boat, I would still be running the BH drive.
Great handling, straight tracking, good slip numbers ( under 9% ) and of course, a sweet rooster tail The BH was on my boat when my avatar pic was shot.
It outlasted bravo x drives by miles too. 160 trouble free hours compared to 20 to 30 out of bravos. I wouldn't hesitate to run one on a light boat with 600hp.
PS, I picked up 8mph over a B1X.
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- Join Date
- Nov 2008
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- 29
04-07-2010 09:50 AMTommy 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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04-07-2010 10:48 AM
Tommy, I'm really happy with what I did to my 454's. If you want the cam specs & stuff like that, PM me.