I'll tell you when I ran from sandbar to the naked turtle last Thursday, beached the boat and saw the exhaust hose smoking, I thought of this thread and how lucky I was. What did you do to keep the boat from sinking?
That night, I removed all regulation, now lots o water and everythings stays cool....
So far I've seen a max of 18 psi with a single 5/8th inlet, splitting 5/8ths to the logs, 2x 1/2 inch to the heads, out of block 2x 5/8th's at my self imposed limit of 4100 RPM.