[THEFERMANATOR]

WOT is the max RPM's you can reach. Red line on an old style 350 would probably be around 5,000-5,500 RPM's. I would not reccomend runing it there for any length of time though. If it were mine I would prop it to run at 4,300-4,400 max RPM's with a light to moderate load. And most all of the marine engines are 4 bolt main blocks. The marine engines were normally modified truck engines, and most of the heavy truck blocks were 4 bolt main blocks. The real low HP engines would have been 2 bolt main blocks, but most anything over 230HP would be a 4 bolt main.