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What Cubic Inch 572, 622?

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Old 04-18-2005, 06:02 PM
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Default What Cubic Inch 572, 622?

It's time to build the engine for my Superboat. I plan on going all natural big cubes 700 - 800hp single carb. 572ci minumum. Should I go bigger like 600+ or not? I'm looking for pros and cons for the attitude of idle and reliability ect...
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Old 04-18-2005, 07:03 PM
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Default Re: What Cubic Inch 572, 622?

well I don't know much about them, but I believe a 572 can be made with bore equal to stroke which at least sounds the most efficient from an engineering prospective... I believe it's 4.5"bore and 4.5"stroke.. but Id like to have 700+ inches also geez wouldn't 8" be enough

Ernie

Last edited by TopSpin80; 04-18-2005 at 07:28 PM. Reason: bore and stroke dimensions corrected
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Old 04-18-2005, 07:18 PM
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Default Re: What Cubic Inch 572, 622?

A 572ci is a square motor but it is a 4.5" bore and stroke.
I have had very good luck with 598 cu combo 4.6 bore and 4.5 stroke. There is no replacement for displacement. This larger bore is suppose to help unshroud the valves a little besides the cubic inches. This has become a very popular combo.
You should be able to make 750-800 hp very easily with some decent heads. we made 740hp with plane heads and Hyd roller cams 6 yrs ago and the heads have improved alot since then.
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Old 04-18-2005, 07:25 PM
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Default Re: What Cubic Inch 572, 622?

Sounds good. No issues with large CI and good idle for Bravo style drives? Much diiference in low end torque compared to a 509 blower motor?
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Old 04-18-2005, 07:25 PM
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Default Re: What Cubic Inch 572, 622?

I had a 588 inch tall deck in my 26' AO. It ran one "monster" carb, roller cam, with all the goodies inside. It made 735HP. built by Bob Wallace of Offshore Performance in Southern NJ,
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Old 04-18-2005, 07:36 PM
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Default Re: What Cubic Inch 572, 622?

Quote:
Originally Posted by blueamerican
I had a 588 inch tall deck in my 26' AO. It ran one "monster" carb, roller cam, with all the goodies inside. It made 735HP. built by Bob Wallace of Offshore Performance in Southern NJ,
Did you like it? Run it again?
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Old 04-18-2005, 08:11 PM
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Default Re: What Cubic Inch 572, 622?

check out the pricing at www.marineassault.net I don't know much about them, just seen their ads around they build a 705" motor

Ernie
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Old 04-18-2005, 08:30 PM
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Default Re: What Cubic Inch 572, 622?

With Warranty cool tripps
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Old 04-18-2005, 08:31 PM
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Default Re: What Cubic Inch 572, 622?

At a 4.60" bore, you are the limit of the block, so when you need to rebuild, you'll need a new block. Why not go with a longer stroke and get more torque out of the engine than boring the block to the limit to begin with. All that aside, if you are going to put this kind of power on a "Bravo style" drive, well, you already know the answer to that one.

Robert
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Old 04-18-2005, 08:35 PM
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Default Re: What Cubic Inch 572, 622?

Quote:
Originally Posted by TopSpin80
check out the pricing at www.marineassault.net I don't know much about them, just seen their ads around they build a 705" motor

Ernie
Thanks, I already have a builder ect. Just want to get more opinions and advice from users first hand.
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