I really want to do it the way the motor sits. Another thing I could do to lower compression would be a 799 or 243 head. I believe they have a bigger combustion chamber and would bring compression to just under 10:1.

People will get in a long line telling you why not .

You have the motor, you have the skill, it has a knock sensor, plenty of cooling available, multiple timing tables, it would sound awesome at full rip. How about leaving the engine compartment open for now so you can use a set of truck manifolds upside-down with a little stack so you can get it going as proof of concept?

Your boat will be connected to a 20 billion quszzilion gallon bucket of water, so all that doesn’t matter.

Water routing to your engine, and engine to exhaust matters as the LS is different hear than standard sbc/bbc.

Start looking up Corey331. He ran into snd figured out many things.

I would definitely be be ok with this, my wife on the other hand, not so much haha. She's with me on the boat 99% of the time so I don't think that would go over to well. If I go through with this I will probably retain through prop exhaust for her sake.

WOW, there is so much information on this site. I think I read through 100+ pages of great LS information. Im almost ready to commit to this project, just need to nail down a timeline so I don't go boatless this summer.

Plan:
-Use the motor as is.
-Crusader manifolds to stock y pipe and through prop
-Cooled via the alpha drive but unsure of distribution. Thinking stock truck water pump with a remote thermostat
-Fuel injected with the fuel tank modified for an in-tank pump
-Stock computer with cut down harness and tuned via HP tuners

I think I have the major components, minus the manifolds and thermostat to make that happen. Im sure there's something im forgetting and all the little things are going to add up, but thats a project.

Link no working🤨

thru prop exhaust????????

Possibly through hull, but the boat does not have holes in the transom so I think starting off through prop is going to be easier and less work. After the setup is in and proven I could see myself putting in captains call.

You will need an O2 sensor right?

Yes. I also plan to run a MAF sensor