Anyone really like their N-R 6, but really hate the"HarveyHand Grenade" 670I engine? I have two of them withholes in the block. They don't run very smooth on 5cylinders, and all that oil on the engine deck is sureslick and messy. As a result I repowered with 855 Cumminsengines. Bottom line, Mega torque, better fuel economy, more reliability while turning my N6 into an N8! Besidesall this, it cost less than a new 670I. I have developed a conversion kit for the water cooled machines. Am working on a kit for the Duetz machines. Any one inter-ested, let me know.