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GM Performance 12568774 - GM Performance 454 C.I.D. HO 425 HP Engine Assemblies

  • Engine Assembly, Crate Engine, Chevy, 454 HO, 425 hp, Cast Iron Rectangle Port Heads, Each
  • Application Specific
  • Warnings
    • This part is shipped via truck freight, additional shipping charges will apply. Multiple truck freight parts on an order may increase the shipping amount.
  • Estimated Ship Date: 5/29/2012
 
BrandGM Performance
Manufacturer's Part Number12568774
Part TypeCrate Engines
Product LineGM Performance 454 C.I.D. HO 425 HP Engine Assemblies
Summit Racing Part NumberNAL-12568774
 
Engine Assembly StyleLong block
Crate Engine Cylinder Head MaterialCast iron
AssembledYes
Engine BalanceExternal
Intake Manifold IncludedYes
Cylinder Heads IncludedYes
Carburetor IncludedNo
Throttle Body IncludedNo
Distributor IncludedNo
Oil Pan IncludedYes
Valve Covers IncludedYes
Timing Cover IncludedYes
Water Pump IncludedYes
Harmonic Balancer IncludedYes
Flexplate IncludedYes
Flywheel IncludedNo
Air Cleaner IncludedNo
Spark Plugs IncludedNo
Spark Plug Wires IncludedNo
Computer IncludedNo
Wiring Harness IncludedNo
Rear Main Seal Style1-piece
QuantitySold individually.
NotesThis engine is not designed, nor intended to be used in any marine applications. Engines installed in vehicles registered and normally operated outside of the United States carry no warranty.
CalculatorCFM Calculator
 

The 454 HO offers tremendous value in a big block crate engine. Based on the Gen VI 4-bolt mains with 1-piece rear main seal blocks with approximately 8.75:1 compression, 425 hp at 5,250 rpm and 500 ft./lbs. of torque at 3,250 rpm. The "HO" stands for High Output, which means you get Forged steel externally balanced crankshafts, forged steel LS6/LS7 "Dimple" rods, shot peened and magna fluxed with 7/16 in. rod bolts. Forged aluminum pistons, hydraulic roller camshafts with .510 in. intake lift, .540 in. exhaust lift and duration at .050 in. for intake is 211 and 230 for exhaust, lobe centerline is 112 degrees. Cast iron cylinder heads with rectangular port 118cc combustion chambers, 325cc intake runner volume with 2.19 in. intake valves and 1.88 in. exhaust. These heads are configured for 3/8 in. thread 7/16 in. shank rocker arm studs. Stamped steel self-aligning 1.7:1 ratio rocker arms come installed along with AC Delco spark plugs. Also included with these crate engines; oil pans, black powder coated aluminum valve covers, black powder coated aluminum timing covers, long style cast iron "V" belt rotation water pumps, 8 in. harmonic balancers, and 14 in. automatic flex plates.

Warranty

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Application

Results 1-1 of 1

 
MakeCHEVROLET
Engine TypeV8
Engine Size7.4L/454
Engine FamilyChevy big block Gen VI
Water Pump StyleShort
Fuel DeliveryCarburetor
CalculatorCFM Calculator
 

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