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GM Big Block 454 HO

GM Big Block 454 HO 7.4L GM Big Block 454 HO
GM Big Block 454 HO 7.4L GM Big Block 454 HOGM Big Block 454 HO 7.4L GM Big Block 454 HO

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Chevrolet Performance’s 454 HO crate engine is a Big-Block bargain an affordable engine with performance specs that will make you think it’s 1970 all over again, including 438 horsepower and 667 Nm.

=> 438 HP @5300 RPM | 667 Nm

A latest-generation block casting with four-bolt main caps is the Big-Block engine’s foundation. It features an all-forged rotating assembly for great strength and durability. It also uses a smooth hydraulic roller camshaft for excellent drivability and a broad performance range. Rectangular-port cylinder heads with large, 2.19/1.88-inch valves round out the assembly.
  • Engine Type: Chevy Big-Block V-8
  • Displacement (cu. in.): 454
  • Bore x Stroke (in.): 4.250 x 4.000
  • Block (P/N 19170538): Cast-iron with four-bolt main caps
  • Crankshaft (P/N 14096983): Forged steel
  • Connecting Rods (P/N 19170198): Forged steel
  • Pistons (P/N 10215228): Forged aluminum
  • Camshaft Type (P/N 24502611): Hydraulic roller
  • Camshaft Lift (in.): .510 intake / .540 exhaust
  • Camshaft Duration (@.050 in.): 211° intake / 230° exhaust
  • Cylinder Heads (P/N 12562920): Iron rectangular port; 118-cc chambers
  • Valve Size (in.): 2.190 intake / 1.880 exhaust
  • Compression Ratio: 8.75:1
  • Rocker Arms (P/N 12523976): Stamped steel
  • Rocker Arm Ratio: 1.7:1
  • Water Pump (P/N 19168606): Cast-iron, long-style
  • Flexplate (P/N 10185034): 14"
  • Recommended Fuel: Premium pump
  • Ignition Timing: 36° Total @ 4,000 rpm
  • Maximum Recommended rpm: 5500
  • Balanced: External
Notes:
• Requires addition of carburetor, starter, fuel pump, distributor and ignition system (not included).
• Clutch linkage bosses are now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance.
• Comes with an externally balanced 14" automatic transmission flexplate; use flywheel P/N 14096987 and 11" clutch assembly for manual transmission applications.
• Not intended for marine applications
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