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Results 1 to 9 of 9
  1. #1
    Registered Gold Member
    My Boats:
    1987 Concord Magnum II
    Join Date
    Apr 2010
    Location
    Daniels, WV
    Posts
    731
    I  Voted

    For All The Guys Wanting to Build Their Small Block..

    ive noticed a lot of posts about guys wanting to add some ponies to their small blocks, here is a link to my build from last year, it may help answer some questions you may have. after i got it together the thing runs great, im gonna work on fine tuning it this year, hope this helps.

    Engine Build Finally Under Way!!

  2. #2
    Registered
    My Boats:
    1984 Formula 242
    Join Date
    Feb 2010
    Location
    Minneapolis,MN
    Posts
    164
    Did you dyno it?

    I built a great 388 sbc for my 242 last summer.

  3. #3
    Registered Gold Member
    My Boats:
    1987 Concord Magnum II
    Join Date
    Apr 2010
    Location
    Daniels, WV
    Posts
    731
    I  Voted
    No dyno, wish I could have but don't have access to one and really not to worried about it, I've seen 64 mPh in the boat and I haven't dialed the carb in yet so I'd say I can get 65-66 pretty easily. It only ran 52-53 before so I was more than pleased with results

  4. #4
    Registered
    My Boats:
    1984 Formula 242
    Join Date
    Feb 2010
    Location
    Minneapolis,MN
    Posts
    164
    I generally dyno because you'll be able to tune it and seat the rings properly as well as ensure your cam has had a a good break in procedure. You can also see where peak torque is etc...

  5. #5
    Registered
    My Boats:
    1995 Mariah 212Z 355
    Join Date
    Sep 2011
    Posts
    118

    Here is my SB Setup

    Quote Originally Posted by 87MagnumII View Post
    ive noticed a lot of posts about guys wanting to add some ponies to their small blocks, here is a link to my build from last year, it may help answer some questions you may have. after i got it together the thing runs great, im gonna work on fine tuning it this year, hope this helps.

    Engine Build Finally Under Way!!
    Here are my 355 specs in a Mariah 212Z. Went from 53 to 63.8 Top Speed

    2 Bolt Main Block
    Edelbrock 1409 Marine Carb 600CfM
    Scat Rods 5.7 Pressed Pin forged
    TRW L2256F + .030 Pistons Forged
    Melling's M55Hv Oil Pump
    Vortec 12558060 - SD8060A Heads
    Comp Roller Tip cc1417-16 Rocker Arms
    Comp Cams XM270HR Roller Cam
    Hydraulic Roller Lifters
    Cloyes True Roller timing set
    Edelbrock 7516 RPM Air Gap
    Crane Ignition HI-6M
    Clevite Bearings
    ARP Fasteners
    GLM Aluminum Semi Tuned Exhaust Manifolds
    Through Hull exhaust with Corsa exhaust tips
    K&N Flame Arrestor
    Powder Coated Stock Valve covers

    I believe i am right around 350 HP at Flywheel. The Mariah 212Z is a narrow beam lightweight Bow (similar to a Stingray) and has a lot to do with the 10 extra mph. If the same motor was in a Sea Ray, Crownline, Cobalt of same length you would not be near 63.8mph (heavy wide beam boats) more like 58mph Max.

    Congrats nice build
    Last edited by Mariah212Z; 02-23-2012 at 10:56 PM.

  6. #6
    Registered
    My Boats:
    1987 Chris Craft Scorpion Limited
    Join Date
    Jul 2005
    Location
    Kissimmee, Fl.
    Posts
    320
    Mariah,
    Are those flat tops with the Vortec heads? How's it do on pump gas, have to use super?

    Magnum thanks for the thread, I'm building mine and have a few questions.
    Thanks

  7. #7
    Registered Gold Member
    My Boats:
    1987 Concord Magnum II
    Join Date
    Apr 2010
    Location
    Daniels, WV
    Posts
    731
    I  Voted
    I guess I could post my specs as well, I don't remember the detas on the bearings and timing chain and what not because my builder ordered all of that but I will post what I know

    350 CID from a 1997 truck
    903 vortec heads
    Performer rpm intake
    650 demon carb ( currently jetted to rich but fixin to fix that)
    Lt4 hot cam kit with 1.6 roller rockers
    9.8:1 flat top pistons ( forged )
    Stock gm crank and rods
    Block decked ( I think it's .013 in the hole )
    Crank balanced
    Stock merc exhaust for now
    Thunder bolt Iv ignition

  8. #8
    Registered
    My Boats:
    1995 Mariah 212Z 355
    Join Date
    Sep 2011
    Posts
    118

    Sb

    Quote Originally Posted by CC230 View Post
    Mariah,
    Are those flat tops with the Vortec heads? How's it do on pump gas, have to use super?

    Magnum thanks for the thread, I'm building mine and have a few questions.
    Thanks
    The pistons are flat tops. Yes I have to run premium fuel to avoid potential detonation. The compression is around 10:1 and the total timing is set at 30 BTC.

    Another good tip is that I have always ran Amsoil 15w40 Diesel and Marine motor oil which I believe is a major part of an engines life.

  9. #9
    Registered
    My Boats:
    1987 Chris Craft Scorpion Limited
    Join Date
    Jul 2005
    Location
    Kissimmee, Fl.
    Posts
    320
    Mariah,
    I figured as much on the compression. X2 on the Amsoil, it's in everything I own.


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