708 ci

www.allstarengine.com

I run Zul's 653's in an 8 foot wide boat (Cig 42) that are Super Tall Deck (11.625) blocks with Dart Pro one heads in side by side application, most other V's are wider than 8ft, I think Fountains are 8'6" and OL even wider so I think they would fit in side by side, even then most new boats are set up to be staggered that would give you plenty of space. I think you can machine those blocks in the 700's if you have the patience and money.

I think when you get into those built numbers for engines most people with the flash to get there will start considering 1075's from Merc and so forth for ease of getting service and re-built altought they are prohibitively expensive to re-build through Merc.

Good Marine engine builders like Tommy at Chief, Zul or JC could build solid high CI engines I have no doubt. Those would probably be maintainable cheaper than Merc's big HP stuff costs to run by the book, but then you are dealing with people that do not built 1000 engines a year and you have to get in line.

Anyway I love the mills I currently run and they run at a fraction of the costs it would to run 1075's from Merc by the book.

http://www.limestonedev.com/images/boat/Mill1.jpg

We have ran a pair of 700 cubes in this Cigarette. Normal maintnance and running them 50 hours a season yeilded good engines. There Cobra's from down in Florida. Also netted us over 120 mph.

John:D

Also there is another route you could go with the boats less than 30' , I believe there are some engine builders (not marine yet) that can put a pretty stout small block package together that can make 1000 hp pretty easy, not even using radical valve train but using a vortec type supercharger. I would think the advantage there is parts galore for small blocks and better fuel usage. And another thought TURBO'S sooo many engine builders are using these today The reliable power you can get from an engine is unreal over 1000hp from less than 400 cu. in.!!!!!!. I can see why in the marine world you want big cubes TQ up the a$$, but I think some people would be pretty impressed with #'s some of those small block turbo or supercharged engines can make.---Brad

Check out this engine. sweet little thing.

http://www.youtube.com/watch?v=N8TXMUaC9Os

I thought as a general rule didnt want to go over your bore with stroke? IE over SQ like Bore & Stroke: 4.750" Bore x 5.00" Stroke

Too much thrust on the cylinder walls, and rod ratio,Pistion speed etc

I dont see Sterling building many 600plus ci engines.

Not sure but I think the NHRA pro stock guys are limited to 5" bore. and I think you can find some manufactures who make blocks that can go as big as 5.5" bore or close to it (Donovan). with the over Sq. not sure how the rule applys but I do know that it all depends on the RPM range. I would ASSume if you keep the rpms below 6000 and use high quality billet steel parts and an a great internal balance job on the rotating assy. it would last. Also I think the 496 cu. in. motor is pretty close to being Sq. but I realy think the big factor is the rod length and how high the pistion pin hight will be. I know a common problem with the Ford 302 stroked to a 347 is the pin hight is up where the oil control ring is and over time causes the motor to start burning oil, but that is because you are limited to deck hight on the block. If they already make the 800+ cube motor for drag its just a matter of some one makeing it work for marine application. The only thing I think that could kill The 800+ cube motor is if the rotating would be to heavy for the current bearing sizes for the rod and crank.

If I remember correctly, years ago Doug Lewis built some mountain motors that were NA and made about 1000 hp.... I think they were in a cat...

I saw them apart at the shop once... The crank was huge...oversized lifters, big azz block with raised cam...as a matter of fact, all the parts were huge....

Panther: did it make 1000hp natural asp. or did it have a blower?

Really what it comes down to is if someone wants to spend the green they could have what ever they want, just look at the boats with jet engines. I just think it would be sweet to see a 39' MTI cat with 2, 800 cu.in. twin turbo fuel injected motors just rippin it up. It would be interesting to see how much power and speeds could be made with that setup.

Panther never mind the question just saw the NA in your post.