Well Ive been doing a TON of research(the small block 400 was just one idea ive seen and the closed loop cooling system totaly makes sence to me..) and Ive seen alot of different boats, setups, opinions, watched vidoes and read alot of forum posts from all over the country and canada. I just dont see many guys running the SB...I know a small block can be built up for cheaper than a BB and the power: weight ratio with a badass pump setup, to me, would run laps around a BB. I love the BBC(I built one myself in my pickup[468]) so im already biased to the BB but the numbers just make sence to run a SB....
Now the closed loop cooling system...why not just run the same setup as a pickup truck? It'll keep all the sand out of the water ports, theres no fuckin with the goddamn water valves(no half turn this, half turn that BS), and you can have the motor run at a consistent temp, just like a car. Id run a super cool tstat maybe in the 160 degree range. Might put a couple 1/8" in the face of the stat to get a little more flow for those long poker runs...if you still wanted to run wet stacks, still use the tap off the pump housing, run your plumbing accordingly, but place a gate between the housing and headers. Also with a closed loop system the chance over over pressuring the water system by having a valvhe open too far or the other being closed too much and blowing a head gasket reduces drastically..I dont actually own a boat myself but Im really interested in seeing what other people have to say about these theories...great numbers/less weight and worry free/consistant cooling...doesn't seem like rocket science lol I look forward to the comments

sent from my smarter than me phone