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12568774 - GM 454HO 425HP Crate Engine

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The 454 HO offers tremendous value in a big block crate engine. Based on the GenVI block, this 425 horsepower iron head engine is a great choice for that muscle car in the garage.
We've heard of several of our customers replacing their rare matching number 396, 427 or 454 with our 454 HO in order to drive their car on today's gasoline without fear of destroying their classic engine.
The HO stands for high output, it also stands for big valves, rectangular ports, forged pistons, forged steel crankshaft, forged connecting rods and four bolt mains. Sounds a lot like the performance big blocks of the late 60's doesn't it ?
When you add in the steel roller camshaft, shotpeened rods, windage tray, one piece rear main seal and high speed single roller timing chain, it sounds more like the performance big block of the 90's. And it is !The 454 HO makes 500 Ft/Lbs of torque with its rectangular port open chamber cylinder heads. With 118cc combustion chambers, the modest 8.75 to 1 compression ratio loves today's pump premium and has no appetite for lead, octane boosters or other fuel additives. Its 2.19" intake and 1.88" exhaust valves and high lift .510"/.540" roller cam let it breath with the best of the early muscle car motors.
With your carburetor, HEI distributor, exhaust system and bright red '67 Corvette coupe (sold separately 37 years ago), you've got a muscle cruiser worthy of your time, effort and expertise.
And, if you want to use your muscle car's fuel system with a mechanical fuel pump, you can because the 454 HO GenVI block has a conventional style fuel pump boss.
The 454 HO is not intended for marine use, and should only be used in 1973 and earlier pre-emissions street vehicles or any year off road vehicles.Technical Note: For manual transmission applications use flywheel #14096987 and a suitable 11" clutch assembly.

Power: 425 HP @ 5250 RPM, 500 ft. lbs. of torque @ 3250 RPM
Displacement: 454 CID
Bore x Stroke: 4.250” x 4.000”
Compression Ratio: 8.75:1
Recommended Fuel: 92 Octane
Block: Cast Iron, 1 piece rear seal, 4-bolt main caps
Crankshaft: Forged Steel
Connecting Rods: Forged Steel
Pistons: Forged Aluminum
Camshaft: Steel Hydraulic Roller Tappet
Cam Lift: .510” Intake / .540” exhaust
Cam Duration @ .050”: 211 deg. Intake / 230 deg. Exhaust
Lobe Separation: 112 Degree
Cylinder Heads: Iron Rectangular Por.
Combustion Chamber: 118cc
Valves: 2.190” Intake/ 1.880” Exhaust
Rocker Arms: Stamped Steel, 1.7:1 Ratio
Balance: External
Maximum GM Recommended RPM: 5500
Ignition Timing: Base 4 degrees BTDC, 26 degrees total

Engine Includes:
• Fully GM assembled long block
• Black Cast Aluminum Valve Covers
• Oil pump, pick-up and oil pan
• Aluminum Performance Intake
• Spark Plugs
• 14” Auto Trans Flexplate
• 8” Harmonic Balancer
• Front timing cover
• Cast Iron Long Water Pump
• Oil Filter and Adapter
• Passenger Side RH Oil Dipstick and Tube

General Motors limited 2 year / 50,000 mile parts & labor warranty. Click on Document tab above for full details.

Related Engines:
GM 502 450HP Crate Engine
GM 502 600+HP Fully Assembled Crate Engine
GM Big Block Serpentine Accessory Drive System

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  • Item Requires Shipping
  • 710.0 lbs.
  • W31.5000” x H33.5000” x L39.8000”
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