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575sci Head service

Old 11-24-2009, 08:22 AM
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Originally Posted by Quinlan
Mine are a little under 650
and OH HE!! they sound good!
Q,
What did you have done to them and by who?
thanks,
Dean
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Old 11-24-2009, 08:41 AM
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I know we are running superchillers which is supposed to add 100HP... so just around 650HP if we are correct... There are kits available raising boost, changing to MSD blue box, and a 120* thermostat but we are quite content with a 93MPH boat... lol
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Old 11-24-2009, 09:08 AM
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Originally Posted by SonicBunny
I know we are running superchillers which is supposed to add 100HP...... lol
SB,
That is one of the first upgrades that I would want to do myself. Great thread!
Dean
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Old 11-24-2009, 09:09 AM
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Originally Posted by Dean Ferry
Sonic bunny,
Not to steal your thread or anything, and I'll be watching this thread with alot interest, but I have a HP ?

How much Reliable HP can made from the Mercury 575SCi and still run 93 octane?
thanks,
Dean

Dean Gellner's built up a few 575's that are producing
700+ hp.

He built a couple of sets of dart iron eagles,
supplied me with the custom HR cam he uses
and remapped the ECM's and mine run awesome

I'm guessing mine are in the 650-675 hp range,
being that we kept the compression stock, and
didn't use the heads he uses on his recipe.
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Old 11-24-2009, 09:28 AM
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Originally Posted by JaayTeee
Dean Gellner's built up a few 575's that are producing
700+ hp.

He built a couple of sets of dart iron eagles,
supplied me with the custom HR cam he uses
and remapped the ECM's and mine run awesome

I'm guessing mine are in the 650-675 hp range,
being that we kept the compression stock, and
didn't use the heads he uses on his recipe.
Do you have chillers on your 575's?
Thanks,
Dean
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Old 11-24-2009, 09:51 AM
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Originally Posted by Dean Ferry
Do you have chillers on your 575's?
Thanks,
Dean

No, don't have clearance necessary for them, and scoops
are out of the question.

The neat thing about them is that they totally
look stock....they don't sound like a stock 575
anymore though.
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Old 11-24-2009, 02:30 PM
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Originally Posted by JaayTeee
No, don't have clearance necessary for them, and scoops
are out of the question.

The neat thing about them is that they totally
look stock....they don't sound like a stock 575
anymore though.
yeah,
I don't know how the scoops thing is going to go over with the wife and kids? But I would really like to have the chillers if I can make it work. It seems to be pretty easy 100 HP?
Thanks,
Dean
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Old 11-24-2009, 05:11 PM
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Originally Posted by Dean Ferry
yeah,
I don't know how the scoops thing is going to go over with the wife and kids? But I would really like to have the chillers if I can make it work. It seems to be pretty easy 100 HP?
Thanks,
Dean
I made a scoop hatch for the last boat, the wife
and her friends hated it, and when rafted up,
the drunks, when crossing boats, seemed to like to step on them......CRACK

My only other worry ( if I were able to add chillers)
was supercharger longevity.

Simply adding the chiller usually doesnt net you
all that power, it's when you add the smaller pulley
along with it that gets you there.

These superchargers have had their share of problems,
in stock form.

Putting a smaller pulley and winging the sh!t out of them probably isn't good for them in the long term.
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Old 11-25-2009, 02:51 AM
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The 575's Vinny P. Rebuilt last winter were mine. We decided to keep them completly stock but use all the best parts. There is something to be said for a 575sci in stock form. They sound and run killer!! Will I be the fastest guy at the next poker run ? No....... But I did finish everyone that I entered and I didn't miss a day out this summer. I would love to crank them up and pull 700+ hp out of them but my season here in NYC is to short to take any chances, Good luck with your rebuild and keep us posted on your results.............. John.

Last edited by Here's Johnny; 11-25-2009 at 03:55 AM.
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Old 11-29-2009, 05:13 PM
  #30  
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Originally Posted by Dean Ferry
Q,
What did you have done to them and by who?
thanks,
Dean

Brad Smith Power in Joplin MO did the rebuild.
The only thing reused was the block and crank.
Punched out to 510, Alum heads. full roller,
On the dyno it was at 715 or so w 700+ ft lbs tq.
that was w smaller pully and REAl gas.
I had him back it down to stock pully and all I can get in OK is 91 so that is where he set it at.

I am VERY happy w the build.

Last edited by Quinlan; 11-29-2009 at 05:16 PM.
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