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
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
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!
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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
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
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
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
3 Year Warranty... let me check the details...
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.
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.
I would love to find out what fuel he uses
90 m.p.h. Out of45 h.p. Is insane...L.O.L. Ed
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.
km/h?
"I don't have time to get into it, but he went through a lot." -Pulp Fiction
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