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01543 431941

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SKU: 12568774

Quick Overview

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

  • 438 hp at 5,300 rpm

  • 500 ft./lbs. of torque at 3,500 rpm

  • The "HO" stands for High Output

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Availability: Out of stock

Excl. Tax: £5,995.00 Incl. Tax: £7,194.00

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Click here to ask us a question about GM 454HO 425HP CRATE ENGINE

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

Tech Specs


  • 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
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