425HP/454 HO GM Performance Parts Crate Engine Assembly

425HP/454 HO GM Performance Crate Engine Assembly - 12568774
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SDPC Part Number: 12568774
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The 454 HO from GM Performance Parts offers tremendous value in a big block engine. Based on the Gen VI block, this is a great choice for your muscle car. Replacing rare matching numbered 396, 427 or 454 engines with H0 lets you drive your car with today"s fuels without fear of destroying your classic engine. The Gen VI block has a provision for a mechanical fuel pump if needed.

Note; the GM oil pan will not clear the Camaro or Chevelle chassis, SDPC offers several different oil pan kits to fit your particular application. A different oil pan can be installed at our facility prior to shipping for a small additional charge.

Old Part Number: 24502618

BlockGen VI Cast Iron, 4 bolt Main
Dur. @ 0.050 I/E211 / 230
Camshaft Type, Lift in. (I/E)Hydraulic Roller, 0.510 / 0.540
Compression Ratio8.75:1
CrankshaftForged 1053 Steel, 4.000 in. Stroke
Heads, Chamber SizeRectangular Port Cast Iron, 118cc
Horsepower425 @ 5250 RPM
Intake ManifoldAluminum Dual Plane
Torque500 ft/lbs @ 3250 RPM
Valves (I/E) (in.)2.190 / 1.880


Submitted by Guest (not verified) on

i have one in a 1979 malibu i beat the crap out of and it does not consumes any oil.....

Submitted by Guest (not verified) on

Altho not purchased thru this dealer, i will post a post an opinion of the engine. The engine I purchased is installed in a 59 Chev with a manual trans. The engine was nearly a year old when installed and another year passed before I started driving the car changed the oil at break-in, and again @ 1000 miles. The car now has 2600 very easy miles and has used 5 qta of oil in the last 1500 miles. The dealer I bought the engine from (not a GM dealer but a vendor), has been no help. Their supplier (GM DEALER) was very nonchalant and could not care less about my issues. A dealer near me was no help, and GM powertrain center has yet to get back to me. I am not the only one with this issue. At least 5 others on a GM model specific forum are having the same issues. One individual did a complete overhaul at 2,500 to hone cyl, install valve seals,
replace rings and bearings.

I just looked into my intake manifold and saw both plenums with rivers of oil in the cast in grooves.

For the amount of money spent on this engine, one would expect it to last more than 3,000 miles.


From SDPC ---
Should have called the pros at SDPC! We have the best contacts at GM and we know how to get things done! We will do everything in our power to see to it that GM stands behind their product. We have sold hundreds of 425hp/454's with no problems.

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