Well I put the big Gators on my Dads GT235 yesterday. It has a 13 year old 18hp Briggs and Stratton pulling a 54C deck. I was afraid the G6 blades would be to heavy for it and work the engine to hard. Been raining alot here in southern Kentucky and grass hadn't been mowed in almost 2 weeks. Was very tall and thick. To my surprise his mower was plowing through it better than ever! That big deck was always a little hard on the 18hp but now it seems to work less. Maybe it's the extra weight of the blades creating more inertia? Only bad thing is we shoulda tried these out years ago.