I have a 1015 Duetz rated at 600 HP in my 40 Wayne Beal with almost 14,000 hour on it. I've been very happy with it. No problems with it that wouldn't be expected with high hours. (water pump and raw water pump both went last year) Three others in my harbor all with over 10,000 hours each. They are BIG and HEAVY but if your looking for a slow turning high tourqe engine that usually comes with it.