I have a 93 260 that I tried to build to wind to at least 8000 rpm safely. I have it on an 1985 Varmint bass boat. I have run it to 92 mph (Handheld GPS). It seems to have strong acceleration and power. However, RPM stays at 7000 RPM regardless of Prop Pitch. 29 drag, 28 and 26 Choppers. tried a 24 pitch drag may that have got me maybe got another 200 RPM. Brucato ACU Rev limiter was supposed to be set at 8200 RPM. Engine has balanced and cut Small Rods and balanced Mahle pistons. Exhaust Chest is cut. Open Offshore exhaust. 150 Cylinder heads. Cant remember what exhaust tuner. Any suggestions as to why RPM'S at WOT will not go above 700 RPM ? (TACH maybe?) I haven't messed with the boat since I moved to Florida 7YRS ago but intend to figure this out when I get back to Kentucky. The boat handles the motor well and is a thrill to drive. I just want that last 1000 RPM if it is there. Thanx for any suggestions you may have.