An LSX with Big-Block power

With the LSX Bowtie block, we’ve built a 21st century 454 with our latest technology. It’s lighter and more compact than an original Big-Block 454.

PART NO. 19355573


627 HP @6300 RPM


586 LB-FT @5100 RPM


The LSX454 is filled with an all-forged, super-tough rotating assembly and features a pair of our deep-breathing LSX six-bolt cylinder heads. It also comes dressed with great-looking, orange powder-coated valve covers with engraved “LSX454” logos.

Installation Guides

Find everything from vital data about your engine’s capabilities to how to install it into your build.

LSX454 Tech Specs

  • Part Number: 19355573
  • Engine Type: LSX-Series Gen-IV Small-Block V-8
  • Displacement (cu. in.): 454 (7.4L)
  • Bore x Stroke (in.): 4.185 x 4.125 (106.3 x 104.8 mm)
  • Block (P/N 19260099): LSX cast-iron with six-bolt, cross-bolted main caps
  • Crankshaft (P/N 19244018): 4340 forged steel with eight-bolt flange
  • Connecting Rods (P/N 19166964): 4340 forged steel
  • Pistons (P/N 19166958): Forged aluminum
  • Camshaft Type (P/N 19166972): Hydraulic roller
  • Valve Lift (in.): 0.648 intake / 0.648 exhaust
  • Camshaft Duration (@0.050 in.): 236° intake / 246° exhaust
  • Cylinder Heads (P/N 19354239): Aluminum LSX-LS7 port; with “as cast” 70-cc chambers
  • Valve Size (in.): 2.200 titanium intake / 1.610 hollow, sodium-filled exhaust
  • Compression ratio: 11.0:1
  • Rocker Arms (P/N 12579615 int): Investment-cast, roll trunnion
  • Rocker Arms (P/N 12579617 exh): Investment-cast, roll trunnion
  • Rocker Arm Ratio: 1.8:1
  • Recommended Fuel: Premium pump
  • Maximum Recommended rpm: 6500
  • Reluctor Wheel: 58X
  • Balanced: Internal

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.