FULLY REFURBISHED with the Powerhouse Lycoming TIO-541-C1B4 Upgrade used in the newer Beech Dukes. They were operational in over 675 aircraft. *2nd Fastest Piston Twin Ever Produced 257 kts@25,000 FT, 2000+ FPM Climb. Both engines Overhauled by Firewall Forward, North America's Top Lycoming TIO-541 Engine Shop. 1805 Lbs Useful load 178 Gal Usable Fuel. Low time engines since complete o......more.