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454CI/425HP Off Road Crate Engine with Iron Head/Roller Cam 12568774 - Crate Engine Depot


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Top > Big Blocks > 454CI/425HP Off Road Crate Engine with Iron Head/Roller Cam 12568774
454CI/425HP Off Road Crate Engine with Iron Head/Roller Cam 12568774
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SKU: 12568774
RETAIL: $7,821.43
YOUR PRICE: $5,553.00


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 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.
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ezstriper

engine would be fine, cam questionable...Rob

Biggus

I bought a pair of the 454 HO's for my old 10 Meter Fountain. They ran flawlessly and took a tremendous beating.

twistedvelocity

I believe that is the ZZ454? and I think it has a marine based cam in it.

twistedvelocity

Sorry was wrong. You can check out the zz454 too it has aluminum heads.

Back4More

I would make sure it has SS valves in it at the least.

Uncle Dave

X2

Its a good place to start.
Aluminum heads would be better. (capt'n obvious here)

Look out for long duration high overlap set ups. These work great on super long automotive dry headers (like the kind this engine made 425hp on) but on a wet marine exhaust will suck the water back into the engine- not good.

Put an oil cooler it in as well.

UD

bigboat28

Would this engine take a supercharger and last?

HTRDLNCN

for a couple dollars more ($5900) you can get a brand new marine 435hp 502 longblock
and know it will work
http://www.1800runsnew.com/newbase-details-NLM.html#502

ballon78

+1 for 1800runs new just bought my 502 435hp a few month ago and building it now. i paid 5799 and its a real marine motor, SS valves