what would be the best size motor for a marine applation?572,598,632.merlin or dart raised block,tall deck?how do they hold up and will they run awhile without a lot of manatince?not looking to get crazy.mild roller hyd,merlin grumpy jenkin 320 cast iron heads.wet sump oiling.850 carb.

I have a pair of 598 GM bowtie blocks built by Goodwin competition in WI. Hope to live a long time. 700+hp

Depends on what you're going to do with it. I'm guessing your heads will be the limiting factor, the bigger bore will breath better, the 4.75 crank may not be the best for rod to stroke angle.

http://www.strokerengine.com/DartBBC.html

lots of options, short deck, I think I favor a 565.

this article is what sells me on that combo http://www.enginebuildermag.com/2012...ss-565-engine/

If you are gonna go big, with a fresh block, rotating assembly, etc, why limit yourself to "Merlin 320" heads, and "850" carb.

Figure out how much power you want to make, then pick the parts to do it. Its hard to beat a nice 4.5" stroke tall deck setup.

I love the 200, 000 mile warranty on Merlins








Ive tried all the other models
Dopey
Sneezy
Sleepy
Bashful
Happy

but grumpy seems to work the best for me.I think you`re on the right track

Of course they will! You only go out once every two years!

How did you come up with a 4.75 crank?

Well, I know how you came up with the 4.75 for a 632, but he listed 2 other versions that can be done with a 4.50 or 4.625 I think.

4.56 x 4.375 or 4.5 x 4.5 for a 572, 4.6 x 4.5 for a 598, 4.6 x 4.625 for a 615, 4.6 x 4.75 for a 632 and on and on, just depends on what you want to spend and where you want to make the power.