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454CI/425HP Off Road Crate Engine with Iron Head/Roller Cam 12568774
Description
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The 454 HO offers tremendous value in a big block crate engine. Based on the Gen VI block, this 425 horsepower cast 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 starts to sound more like the performance big block of the new millenium. 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 breathe with the best of the early muscle motors.
With your carburetor, HEI distributor, exhaust system and bright red '67 Corvette coupe (sold separately 34 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 Gen VI block has a conventional style fuel pump boss.
The 454 HO is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles. Equipped oil pan may not clear Chevelle and Camaro applications.
454 HO Technical Information
Horsepower ..................... 425 @ 5250 RPM
Torque .......................... 500 @ 3250 RPM
Max. Recommended RPM ..... 5500
Compression Ratio ............. 8.75:1Block ............................ 12550307 Cast Iron - Four bolt mains
Crankshaft ...................... 14096983 Forged Steel
Connecting Rods ............... 10198922 Forged Steel
Pistons .......................... 10215228 Forged Aluminum
Piston Rings .................... 12523921
Camshaft ........................ 24502611 Hydraulic rollerLift: .510" I, .540" E.Duration @ .050: 211o I, 230o E.
Timing Chain ................... 10114177 Single Roller
Cylinder Heads ................. 14096801 Cast iron 118cc combustionchambers
Intake Valves ................... 14097045 2.19"
Exhaust Valves .................. 14097049 1.88"
Valve Springs ................... 14097002
Rocker Arms .................... 12523976 1.7:1
Torsional Damper .............. 10216339 8"
Flexplate ........................ 10185034 14"
Valve Lash ...................... Net lash
Fuel ............................. 92 Octane
Spark Plugs ..................... MR43T Gap .045#10 Rapid Fire Gap .045
Ignition Timing .................. 4° BTDC
Technical Notes:
For manual transmission applications use flywheel14096987 and a suitable 11" clutch assembly. Distributor P/N 1104067 ormelonized distributor gear P/N 10456413 must be used on all crateengines with steel camshafts.
Service Parts Listing Terms and Conditions
Warranty Information
GM Performance Crate Engine Start-up Instructions
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Products Accessories for 454CI/425HP Off Road Crate Engine with Iron Head/Roller Cam 12568774
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