Welcome Guest - Sign Up today
Welcome Guest - Sign Up today



Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
See more
See less

Mercruiser 7.4 LX EFI, repower options

  • Filter
  • Time
  • Show
Clear All
new posts

  • Mercruiser 7.4 LX EFI, repower options

    I'm afraid that my original -97 model big block might be toast and I'm mapping out my options for a new engine. It's a Bravo III setup on a 23 feet Cobalt and I think that paying a shop to install all the stuff to a new long block 454 from my old engine might be almost as expensive as buying a new one. + I would still have a lot of old parts on the engine. The best price I've found for a new complete 496 is about $11K. The price difference between the Merc. 496 Magnum (375 hp) and 496 HO (425 hp) is only about a thousand bucks but I don't know if the original Bravo from the 300 hp 454 would work directly with the 496 HO engine. Would I need to change the gears and props to make it to work or do I face the same thing even with the 375 hp version?

    Michigan motorz had a Marine Power 496 for about $10K but I don't have any experience on their engines. Does anyone know about these? One shop offered a good price on a 383 stroker but I don't really feel like downgrading either. All ideas and suggestions are welcome, thanks.

  • #2
    Re: Mercruiser 7.4 LX EFI, repower options

    You might want to talk to a MERC dealer about using the older drive with a 496HO (the Bravo is supposed to be good for about 400hp or so.....425 might just be fine). I think it would be ok with the 375HP model.(I've been thinking about that one myself)

    Your other option might be to just to replace the 454 with a long block...But I don't see how it would be the same as getting a new bigger engine. A GEN-6 454 long block from Ebasicpower for example, is about $3500.
    1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
    Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III


    • #3
      Re: Mercruiser 7.4 LX EFI, repower options


      If you're not a Mechanical kinda Guy,.....
      I can see why you're thinking Complete Bobtail engine package,.....

      If your Bravo has been treating you Well,....
      I'd consider a good going thru your Drive,+ Freshening it,........
      I think your Bravo will be just fine, as long as you're not out Hammering it all the time,....
      Treat it kindly,+ It'll carry that HP to the water for you, for a Long Time.......
      Either of the 496 motors would be a Nice Package.......


      • #4
        Sign up today
        Re: Mercruiser 7.4 LX EFI, repower options

        Thanks for the input guys. I think I could install all the stuff needed to the new long block from my old engine but the thing is I don't have a place to do that. I have the dock place and that's it. Can't really do it in the water properly. Also I'd have a new long block but old accessories, injection etc. so it wouldn't really be a new engine. If I have someone to do it, it would probably be close to a new bobtail in $$. So you think that even with the 496 HO the gears and props from the Bravo III would work? I should know this week what the old engine ate so by next week I either will be driving with the old 454 or ordering a 496. I'll probably go with the Mercury one because I think that the resale value of the boat will be better with the merc than Marine Power as nobody seems to know too much about the MP.