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

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Old 02-22-2012, 11:20 PM
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Location: Daniels, WV
My Boats: 1994 Concord Mach III
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Default 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.

http://www.offshoreonly.com/forums/d...under-way.html
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Old 02-23-2012, 10:30 AM
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Did you dyno it?

I built a great 388 sbc for my 242 last summer.
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Old 02-23-2012, 02:01 PM
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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
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Old 02-23-2012, 03:31 PM
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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...
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Old 02-23-2012, 09:50 PM
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Default 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.

http://www.offshoreonly.com/forums/d...under-way.html
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 09:56 PM.
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Old 02-24-2012, 06:08 AM
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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
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Old 02-24-2012, 09:41 AM
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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
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Old 02-25-2012, 06:59 AM
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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.
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Old 02-25-2012, 09:09 PM
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Mariah,
I figured as much on the compression. X2 on the Amsoil, it's in everything I own.
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