Ultima® is now offering the new “El Bruto®” Series Engines which are designed to provide our customers with a U.S.A. built High Performance engine that is priced to be the best value of any engines now on the market. Ultima's commitment to engineering excellence and competitive pricing brought El Bruto® to life with a completely new designed set of castings emphasizing performance, reliability, and value. All of the castings in these engines are based on all-new CAD designs cast from C355 aluminum, a common U.S. military alloy known for its stability over multiple heat cycles. The engine components are machined on state of the art CNC equipment for guaranteed dimensional accuracy and repeatability. All of our engines are dynamically balanced using proprietary methods to provide the smoothest running engines on the market and now with our new high flow cylinder heads these engines now can boast the most powerful engines on the market as well!! We think that you will agree these engines are the best value anywhere. 6 Month warranty from date of purchase. Case Made In U.S.A. Cast-in steel inserts guaranteed not to move. Large bore breather for increased crank case vacuum and less blow by. 1/2” Alignment dowels for true line bore. Counterbored stainless allen head case bolts. Close machining tolerances. Made from prime C355-T6 aluminum that is superior in strength to A356. Styling and cosmetic machining for a custom look. Crankshaft Our New state of the art designed crankshaft incorporates a massive 1.670 diameter pin that is pressed into the one piece, heat treated, 4140 steel flywheel half making these crankshafts some of the strongest available on the market today. These crankshafts feature all new 7.7” long H-Beam rods with .927 diameter wrist pins to handle all the power you can throw at them. These are also balanced using our exclusive methods making these some of the smoothest engines in the industry. Cylinder C355-T6 Casting. Cast in liners will not move. All fins are machined for an excellent cosmetic appearance. Cylinder Head C355-T6 Casting. All fins are machined for excellent cosmetic appearance. Twin Cam Styling means 30 % more fin than most Evolution® style heads for cooler running. Compression release valves. 2.100 stainless intake valves, 1.700 stainless exhaust valves. Manganese Bronze guides. High silicon wire valve spring with chromoly retainer. Ultima 4.25 Bore 120 Engine Bore: 4.25”. Stroke: 4.25”. Piston: Forged. Compression: 9.8:1. Rated Power: 130RW Horsepower. 135 LB FT Torque. Camshaft: .640” lift. Pushrods: Crane. Valve Spring: Ultima®. Chrome Nose Cone / Rocker Boxes. Billet Oil Pump. Chrome Tappet Blocks. Ignition included on assembled engines. Ultima 4.25 Bore 127 Engine Bore: 4.25”. Stroke: 4.5”. Piston: Forged. Compression: 10.2:1. Rated Power: 140RW Horsepower. 140 LB FT Torque. Camshaft: .640” lift. Pushrods: Crane. Valve Spring: Ultima®. Chrome Nose Cone / Rocker Boxes. Billet Oil Pump. Chrome Tappet Blocks. Ignition included on assembled engines.