I have a 271 fastech repowered to a 540ci sure did wake it up at about 12hrs with a 28p iam running 77.9 GPS @5200 / with two other people on board moter is map @ 5450 with a 30p and driver only running 74.2 @4800 luv the boat but gets ignorant at that spd going to try putting some balest in cabin and try it again still some throtle left looking for 81/83 mph ANY OTHER IDEALS

shorter lower on the drive

Does it start to chine walk at those speeds? Do you have full hydraulic steering? I have a 98 271 rigged with the less than stout bennett trim tabs. Maybe some 280 kplanes would help your handling issues.

start,s chine walking at 72 mph BUT only when i,am in the boat . had two other people with when i hit 77.9 on lake MICH with less then 1 foot wave,s and never acted up at all / yes i have the bennett,s also gave thought to the 280 kplanes but this year have spent a tidy little sum that,s why i would like to try 2 or about 4 bag,s of play sand in cabin, anybody try that yet TONY aka ***etaboutit !

yes it does have a 1 inch imco shorty !

I WILL BE DOWN AT THE SHOOT OUT look for me if you will be there

Anyone looking for 80 without full hydraulic steering is one crazy mofo. IMHO.

yes hydro steering also have not loss it yet but thanks for checking !

what drive and drive ratio are you running?

1.50 1 inch shorty by imco XR drive