I do not know if the 540 in the 860 can handle it. The original engine in my 860 through a rod through the side of the block just and I mean just after the new warranty expired. It was from a under torqued rod bolt from the factory. Any way after a lot of writing and finger pointing I recieved a letter from the supplier of the engine to Massey which states they had told Massey the engine were turned up to high as it was. I have a 2745 with the 540 V8 and it is only rated at 140 PTO horsepower. ****PS the repair bill for the 860 was just over $16,000.00 when Canadian money was worth something.****** I am not sure I would want to chance turning up the power any more unless I researched VERY VERY carefully.