Ultima 4.25 Bore 120 Engine
Ultima 4.25 Bore 127 Engine

Bore: 4.25”
Stroke: 4.25”
Piston: Forged
Compression: 9.8:1
Rated Power: 130 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.

Bore: 4.25”
Stroke: 4.5”
Piston: Forged
Compression: 10.2:1
Rated Power: 140 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.

El Bruto® Series
Ultima 4.25 Bore 120 and 127 CI  Engines & Long Blocks
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.

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.
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.
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.

120 CI Complete Engine Assembled
298-256 Complete 120CI Engine, Natural.
298-257 Complete 120CI Engine, Black.
298-258 Complete 120CI Engine, Polished.   

120 CI Complete Engine Unassembled
298-256U Long block 120CI, Natural.
298-257U Long block 120CI, Black .
298-258U Long block 120CI, Polished

120 CI Long Block Unassembled
298-278 Long block 120CI, Natural.
298-279 Long block 120CI, Black .
298-280 Long block 120CI, Polished.

127 CI Complete Engine
298-272  Complete 127CI Engine, Natural.
298-273  Complete 127CI Engine, Black.
298-274  Complete 127CI Engine, Polished.

127 CI Complete Engine Unassembled
298-272U  Complete 127CI Engine, Natural.
298-273U  Complete 127CI Engine, Black.
298-274U  Complete 127CI Engine, Polished.
127 CI Long Block Unassembled
298-284  Long block 127CI, Natural.           
298-285  Long block 127CI, Black.
298-286  Long block 127CI, Polished.


>> Competition Series Engine Owners Manual <<

True to their name,
the 4.250" bore
120 and 127 inch El Bruto
Engines are horsepower
extrordinaires. They are the
most powerful EVO
configuration of these sizes.
These brutes have features
which insure long life and
pure riding enjoyment
for those who need ultimate

Rated Power
120 C.I. / 130 HP
with 135 LB FT Torque.

Rated Power
127 C.I. 140 HP
with 140 LB FT Torque.

Not EPA Compliant.