I have a four winns V-275 which has a hull lenght of 25'7" and weights in at 7,800 empty. Its powered with a Volvo 320 (5.7) with a bow thruster. The boat performs well and burns 7.9 gal per hr. average since 2015 new. I would not recommend going past these specs with the 5.7. A 29 ft. at 8500...