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454CI/425HP Off Road Crate Engine with Iron Head/Roller Cam 12568774 Description
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.
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. 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.
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.
The 454 HO Gen VI block has a conventional style fuel pump boss.
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