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tech notes

    E303 Camshaft - Auto or Manual Transmission
  • New BOSS 302 crate engines feature race quality components at competetive pricing.
  • Utiilizing all forged internals the X302E and X302B crate engines are an excellent value and a solid foundation for any performance combination including forced induction.
  • 302 cubic inches
  • 340 hp
  • 9.0:1 compression ratio (nominal)
  • Forged pistons
  • Forged steel connecting rods
  • BOSS 4-bolt main block M-6010-BOSS302
  • Hydraulic roller camshaft M-6250-E303 , .498" lift intake and exhaust, duration at .050" is 220 degrees intake and exhaust
  • Double roller timing chain set M-6268-A302
  • Forged steel crankshaft
  • Rear sump pan fits most Fox body cars
  • Ford Racing aluminum GT-40 "X" cylinder heads M-6049-X306 with 1.94" intake valves and 1.54" exhaust valves
  • Roller rocker arms 
  • Does not include intake manifold or distributor (MSD distributor part no: M8598 recommended)
  • Built with all NEW Parts
  • Can be used in kit cars, street rods, Mustangs, Fox-bodied cars, and trucks

INSTALLATION NOTES: Some or all of the following items may need to be changed from your original engine or modified for proper installation: 
  • Depending on your application, a different timing cover, water pump, oil pan and pickup may be required.

  • Engine has a rear sump oil pan and pickup, standard rotation timing cover, reverse rotation water pump and non-EFI valve covers.
  • Timing cover will work with most standard rotation water pumps
  • Fuel pump eccentric M-6287-B302 installed, allows use of mechanical fuel pump
  • A reverse rotation water pump is installed. Other applications may require different water pump and timing chain cover.
  • Valve covers M-6582-W351PR should fit most non-EFI applications. Optional valve covers sold separately.
  • The damper M-6316-D302 may require a spacer for pulley alignment.
  • Flywheel included M-6375-D302B should work for most 157-tooth manual transmission applications. For other transmissions use the proper neutral balance flywheel.
  • Intake manifold not included
  • Includes intake gaskets M-9439-A50 and pilot bearing
  • Firing order 1-3-7-2-6-5-4-8 (5.0L HO and 351W firing order)
  • Steel distributor gear required
  • Shipping weight approximately 525 lbs
  • Built with current available parts. Photo and specs may vary.
  • Engine installation tuning tips at
  • See Also...
  • Crate Engine Build-Up
  • Crate Engine Warranty
  • Engine Tips & Specs
  • Crate Engine Catalog


Package Dimensions:
39 x 36 x 36
Package Weight:
528 lbs
Part Type:
Engine: Complete Engines
Instruction Sheet:
Warranty Availability:
Country of Origin:
United States
UPC Code:
Catalog Page Number: