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tech notes

Built on Ford Racing’s new BOSS 351 block, the X head 427 crate engine is engineered and built to deliver a strong and flat torque curve. That translates into tire-smoking acceleration for street rods, kit cars and muscle cars.  It also delivers power and torque for light duty pickups and SUVs.

  • 450 hp @ 5600 rpm
  • 520 lb-ft torque @ 4500 rpm
  • 351-based small block Ford engine
  • Displacement 427 cu. in.
  • 4.125" bore x 4.00" stroke
  • BOSS 351 9.5" deck block
  • SCAT® forged steel crankshaf
  • SCAT® forged steel I-beam connecting rods
  • Forged Mahle® pistons w/floating wrist pin
  • Hydraulic roller camshaft
  • .563"/.584" camshaft lift
  • Camshaft duration 232°/240° @ .050"
  • Ford Racing Aluminum 64cc Chamber Cylinder Heads M-6049-X306
  • 1.94" intake valves and 1.54" exhaust valves
  • 10.5:1 compression ratio
  • 1.60:1 ratio roller rocker arms
  • Vibration Damper Ford SFI approved
  • Ford Racing cast aluminum black wrinkle finish 427 Cobra scriptvalve covers M-6582-W427B
  • Steel 7-quart oil pan with windage tray and scraper
  • Long-type standard rotation water pump included
  • Distributor not included. MSD distributor #85840 recommended (distributor modifications necessary for intake clearance)
  • Unleaded premium fuel required
  • Maximum recommended rpm: 5600 rpm
  • Internal balanced. Use neutral balance flywheel
  • New block, oil and water pumps, performance oil pan and high-performance harmonic balancer
  • Can be used in kit cars, street rods, Mustangs, Fox-bodied cars and trucks


Package Dimensions:
39 x 36 x 36
Package Weight:
520 lbs
Part Type:
Engine: Complete Engines
Instruction Sheet:
Not Available
Warranty Availability:
Country of Origin:
United States
UPC Code:
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