LPG

Keith built a set of 598CID,1200HP engines that run on 93 and have been very reliable. They are in a 44 MTI going on there 3rd season without any problems. Have not seen many 93 octane engines over 1200HP last one season in a boat. Not that it could not be done. The V16's are the only engines that we know of that can do over 1600HP on 93 octane mainly because your looking at over 1100CID.

Young Performance

I built my first 1200 hp, 93 octane engine about 8 or 9 years ago. I actually dynoed them on 91 octane, but never tried it in the boat. Always ran 93. After 2 seasons, we stepped them up to 1400 on 100 octane. They got freshened at 100-120 hours. I have since built quite a few pairs of them, the most recent in a 399 Skater V that I won the non-pro Top Gun award with at LOTO this year. They are actually made 1326 hp on the dyno, but I backed them down to 1229 hp in the boat. They have all been conventional head (no Big Chiefs) hydraulic roller engines. I am confident that 150 hours is possible. The longest I have taken one to is just over 125 hrs. and was very pleased with what I saw. I know there is more power to be had with Big Chiefs and a solid roller, but I would rather have the longevity and maintenance of the conventional heads and hydraulic roller. I'm sure there are a number of guys making over 1200 hp on pump gas. It really isn't that hard to do anymore.
Eddie

Philm

WildWarrior has a set of 1350's with meth injection that turned 300 hours this year, running on 93.