540ci with 8-71s 4% underdriven. So far the best mph with the scx's is 87mph @ 5200 rpm. I am raising the drive up another 1/2in. and testing it out this weekend. The 17 x 28 4 blade cleavers worked the best out of all the props i have tried. 30 and 32 bravo1 4 blades, 15.625 30 pitch maximus, 17x26 4 blade cleaver and a 17.5x 30 4 blade cleaver. Hopefully raising the prop will get me alittle rpm. My goal is to get it to run 90mph with 3/4 to full tank of and couple of people in the boat.
