Page 3 of 5 FirstFirst 1 2 3 4 5 LastLast
Results 31 to 45 of 75

Thread: Donzi 22 Re-Power 377 Scorpion

  1. #31
    Join Date
    May 2001
    Posts
    10,510
    Rep Power
    34
    Have you thought about the exhaust outlets most likely the SB will not match up with the BB

    here is the 400 with the cmi and the 383 350 hp with merc risers

    again I would go with BB and re-use what ever you can
    Attached Images Attached Images
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  2. #32
    Join Date
    Jun 2015
    Posts
    34
    Rep Power
    0
    that's a good point. I don't think about all of these things, and I trust the dealer too much.

    thanks for the info to look into!

    Quote Originally Posted by mattyboy View Post
    Have you thought about the exhaust outlets most likely the SB will not match up with the BB

    here is the 400 with the cmi and the 383 350 hp with merc risers

    again I would go with BB and re-use what ever you can

  3. #33
    Join Date
    Oct 2012
    Posts
    719
    Rep Power
    0

    good choice to replace an old 330/454, not a 454HO

    Quote Originally Posted by TheSharkGuy View Post
    The invoice he sent me reads: "6.2L / 377 Scorpion Marine Engine"

    I found this one on a mercury website but it says 340HP. The dealer says the one he is selling me tests 350HP at the prop.

    http://www.mercurymercruiser.com/mer...Scorpion%20377

    Thanks again for the help / info...

    .
    Have you desided to buy a Merc package and replace the drive?
    If no, then I suggest you stick with a big block.
    I've got the base 502 and the boat runs great.
    http://www.1800runsnew.com/newbase-details-NLM.html#502
    Thank you, Patrick
    1994 18' Classic 350Mag Alpha

    Previously owned Donzis -
    1996 22' Classic, 502Mag Bravo
    1987 20' Minx, 350Mag Alpha
    1975 18' Classic, 350Chevy Volvo 280

  4. #34
    Join Date
    Feb 2005
    Posts
    1,991
    Rep Power
    21
    what RPM is it making 350 HP? The link for the stressed relieved re-manufactured 502 from Tri Star is a good replacement for a 454. I believe all of the 454 parts would fit on it. Poke around Tri Star's site you'll see they are more than just an engine builder. They are a full service engine machine shop. What sold me on my short block was not just price but quality off parts used and the fact that they internally balanced the engine assembly in house. Also It was bored, decked and lined honed on a CNC. You could never get that machining quality out of a stock Merc AKA GM performance block. Or better yet drop this bad boy in there for 1/2 the price of the Merc and watch the look of the blue motor boys when your king cobra goes by them
    http://www.tristarengines.com/catalo...ne-series.html
    machinist ,bore it deeper,ream it bigger, and lap it to a fine finish



    https://www.facebook.com/photo.php?v...=2&theater

  5. #35
    Join Date
    May 2001
    Posts
    10,510
    Rep Power
    34
    motor mounts may be another area of concern with going to a SB drilling stringers is always a roll of the dice.
    When the sky is grey,look out to sea.
    When the waves are high and the light is dying,
    well raise a glass and think of me...
    When I'm home again,
    boys, I'll be buying!

    My Ride

    Come Join Us on The Queen Of American Lakes



    Contact Us

    www.lgdonziclassic.com

  6. #36
    Join Date
    Jun 2015
    Posts
    34
    Rep Power
    0
    I sent pics of the engine well to him and he said he uses the same mounts so that will make it easier.

    Another part of this equation is that my father has offered to split the cost if we go with the new scorpion and new out drive package. He is all about the "new" and is really pushing it even though just about EVERY one of you said to go with a rebuilt / crate big block.

    You guys sold me on the big block, but the financial help from my father isn't a bad deal either.

    Quote Originally Posted by mattyboy View Post
    motor mounts may be another area of concern with going to a SB drilling stringers is always a roll of the dice.

  7. #37
    Join Date
    Oct 2012
    Posts
    719
    Rep Power
    0

    SBC and BBC of similar vintage mount the same

    Quote Originally Posted by TheSharkGuy View Post
    I sent pics of the engine well to him and he said he uses the same mounts so that will make it easier.

    Another part of this equation is that my father has offered to split the cost if we go with the new scorpion and new out drive package. He is all about the "new" and is really pushing it even though just about EVERY one of you said to go with a rebuilt / crate big block.

    You guys sold me on the big block, but the financial help from my father isn't a bad deal either.
    Chevy 350 and 454 blocks use the same Merc bell housing and motor mounts. I have no idea about OMC.

    To go from OMC to Merc, your likely going to be filling and drilling new holes in the transome and stringers.

    For the exhuast, there may be some sort of off-set adapter to mach the wider spaced thru hole if your using the short Merc risers.

    I agree, take Dad's money/help. What's the warrenty on the new package?
    Thank you, Patrick
    1994 18' Classic 350Mag Alpha

    Previously owned Donzis -
    1996 22' Classic, 502Mag Bravo
    1987 20' Minx, 350Mag Alpha
    1975 18' Classic, 350Chevy Volvo 280

  8. #38
    Join Date
    Jun 2015
    Posts
    34
    Rep Power
    0
    3 Year Warranty... let me check the details...

  9. #39
    Join Date
    Jul 2001
    Posts
    14,603
    Rep Power
    38
    GM mounts are GM mounts not marinizer specific.
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  10. #40
    Join Date
    Nov 2013
    Posts
    19
    Rep Power
    0

    Sb to bb or bb to sb is a direct drop in

    I put a 350 mag directly into my boat that had the 454 bb in it. The exhaust was just 4" rubber exhaust but went right on and didn't have any issues with it. Both were straight from the manifolds to the tips. The mounts dropped right into place. I only had to adjust for the alignment. That was not correct with the bb or the sb until it was adjusted.
    The only way the mounts will move is if the omc and merc transom assemblies move the motor forward or backward due to depth difference in the 2 manufacturers. I'm not sure of that will change or not, I'm not very familiar with omc, I do know of a guy who has a 90 mph sunbird with a 45 hp sb and a stock cobra. A few case design upgrades for water flow but internally stock. The guy said that's the only thing he has never had a problem with.

  11. #41
    Join Date
    Mar 2000
    Posts
    5,349
    Rep Power
    31
    I would love to find out what fuel he uses
    90 m.p.h. Out of45 h.p. Is insane...L.O.L. Ed

  12. #42
    Join Date
    Jun 2015
    Posts
    34
    Rep Power
    0
    He must mean 90mph out of 450hp, right?

    Quote Originally Posted by Ed Donnelly View Post
    I would love to find out what fuel he uses
    90 m.p.h. Out of45 h.p. Is insane...L.O.L. Ed

  13. #43
    Join Date
    Nov 2013
    Posts
    19
    Rep Power
    0
    Yes 90 out of 450 hp small block. At least he says it's 450. I know it's one of the fastest boats around here with stock internals in a cobra drive. I'm not a big fan of omc but apparently they are pretty strong.

  14. #44
    Join Date
    Apr 2001
    Posts
    3,909
    Rep Power
    27
    Quote Originally Posted by dbleil89 View Post
    Yes 90 out of 450 hp small block. At least he says it's 450. I know it's one of the fastest boats around here with stock internals in a cobra drive. I'm not a big fan of omc but apparently they are pretty strong.
    Trying to be gentle here. Not possible, unless that thing is a 450HP small block attached to a 2x4.
    It takes 650-700HP to pass 90 in a 22 Classic Bravo configuration for comparison purposes. And yes,
    the lake is normally full of "80 mph" performance boats that get passed at 65. Seriously.

  15. #45
    Join Date
    Dec 2007
    Posts
    4,279
    Rep Power
    21
    km/h?
    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •