Help with 303 formula 500 h.p.
 

Running stock 26 B1 4700 @ 73mph These motors are modified 454@ about 500 hp This was a few days ago with 1/2 tank fuel. The boat has always ran great with mirages and For all out speed it is a 3 blade. What do you think of a labbed 27 mirage?? Also ran worked 26 B1 that where done by Merc. to a 27 and the result really didn't change all that much.

The 3 blades will ultimately give you the best top end.