Ya cooked it. Burned # 3 valves at the very least. #3 cyl runs the hottest by design due to the position of the oil cooler in the fan housing partially blocking it. Luckily it's one of the easiest engines to overhaul. They sell kits for everything. Although I'd try to get a 53 hp engine and overhaul it. Alot more options. Where else can you pull an engine in 30 minutes?