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...

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 :D geez wouldn't 8" be enough

Ernie

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.

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?

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,

Re: What Cubic Inch 572, 622?
 

Did you like it? Run it again?

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

Re: What Cubic Inch 572, 622?
 

With Warranty :eek: :eek: :eek: cool tripps

Re: What Cubic Inch 572, 622?
 

Re: What Cubic Inch 572, 622?
 

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