Ultima 298-257 El Bruto 120ci Evolution-Style Engine Black Finish

Demon’s Part # 101691 Mfg. Part # 298-257


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El Bruto 120ci Evolution-Style Engine Black Finish

Ultima has put together their first high output engine package for the most demanding performance enthusiast. The El Bruto Series 120ci 4.25" bore engine is factory assembled and features heavy-duty C355 casting and dynamic balanced press pin crankshafts. Features a large bore breather for increased crankcase vacuum and less blow-by, 1/2 alignment dowels for true line bore, prime C355-T6 aluminum casing, one-piece heat-treated 4140 steel flywheel, and machined fins for an excellent cosmetic appearance. Twin cam styling means 30% more fin than most Evolution style heads for cooler running.

It comes complete with carburetor, ignition MSO, and warranty.


  • 25" bore
  • 25" stroke
  • Mahle forged pistons
  • 8:1 compression ratio
  • 130RW HP rated power
  • 135 lb/ft torque
  • Chrome nose cone/rocker boxes
  • Billet oil pump/tappet blocks
  • Mikuni 45mm HSR series carburetor
  • All fins are machined for excellent cosmetic appearance
  • Twin cam styling
  • 30% more fin than most Evo style heads for cooler running
  • Camshaft: .640" Lift
  • Pushrods: Crane
  • Valve spring: Ultima
  • Billet oil pump
  • 700 stainless ex valves
  • Manganese bronze guides
  • High silicon wire valve spring w/ chromoly retainer