what do you guys figure the lowest rpm @ wot with about a 9:1 compression ratio with 93 octane would be with stock thunderbolt IV ign before it starts detonating.

In other words, I make about 300hp and turn 21 Mirages about 4800 with cast internals. How much more prop can I turn?

Here`s old thread of my 350 build...

http://www.offshoreonly.com/forums/s...t=dyno+results

Run over 200hrs `til I sold it this summer.

Mike

ps.thanks to Bob/FTM