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Chevrolet - 454 HO ENGINE ASSEMBLY | |
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The Gen VI 454 HO offers outstanding performance and value in an over-the-counter engine package for off-highway applications. Keys - allengine, scperformanceeng, gmperformanceeng, gmgoodwrencheng. Use allengine for a complete list of all three. |
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454 PERFORMANCE CRATE ENGINES NAVIGATION | |
| ZZ454/440 MAIN PAGE | ZZ454/440 PICTURES |
| 454 XTREME 4x4 Main Page | 454 XTREME 4x4 Dyno Results |
| 454 XTREME 4x4 Photos | HO 454 |
| RAM JET ZL1 454 (No longer Available, information only.) | 454ci (7.4L) Partial Engine |
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We have more GM and Chevrolet Performance Engines available. We have more GM Stock Replacement Long-block Goodwrench Engines available. We have more “Gen 3” and “Gen 4” Design Engines available. (LS1, LS2, LS6, LQ4, LS7) |
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454 HO ENGINE ASSEMBLY DESCRIPTION | |
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7.4L (454ci) HO Engine Assembly
P/N 12568774
The new Gen VI 454 HO offers outstanding performance and
value in an over-the-counter engine package for off-highway
applications. It is the successor to the popular Mark IV LS-6
assembly, which has been discontinued. When equipped with an
aftermarket four-barrel carburetor and aftermarket headers, a
prototype 454 HO produced 425 horsepower and 500 lb-ft torque.The 454 HO is based on the “Gen V” big-block V8 that was introduced in 1991. This revised Gen VI engine design also includes a leak-resistant one-piece rear crankshaft seal, relocated oil passages, a redesigned oil filter pad with integral oil cooler connections, cast alum. rocker covers, and 4-bolt main bearing caps. The 454 HO is completely assembled, less ignition, spark plug wires, carburetor, and exhaust manifolds. It includes a water pump, torsional damper, and automatic transmission flexplate. The 454 HO has a high-rise aluminum for barrel intake manifold and high-performance rectangular port cylinder heads. These cast iron heads have open-style combustion chambers and 2.19/1.88” diameter valves. |
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With 118cc combustion chambers, the modest 8.75:1 compression ratio loves today’s
pump premium gas 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” I / .540” E roller cam let it breathe with the best of the
early muscle motors. If you want to use you muscle car’s fuel system with a mechanical 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. |
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454 HO ENGINE ASSEMBLY SPECIFICATIONS | |
| Part Number: | Old P/N 24502618, Current P/N 12568774 |
| Displacement: | 454 cubic inches (7.4-liter) |
| Horsepower: | 425 @ 5,250 RPM |
| Torque: | 500 @ 3,250 RPM |
| Max. Rec. RPM: | 5,500 RPM |
| Comp. Ratio: | 8.75:1 |
| Block: | P/N 12550307 Cast iron four bolt main caps. |
| Cylinder Bore Dia.: | 4.250” |
| Crankshaft: | P/N 14096983 Forged 1053 Steel |
| Crankshaft Stroke: | 4.00” |
| Connecting Rods: | P/N 10198922 Forged 4340 steel, 7/16” bolts, shotpeened |
| Pistons: | P/N 10215228 Forged aluminum |
| Piston Rings: | P/N 12523921 |
| Cylinder Heads: | P/N 14096801 Cast iron rectangular port, open chamber, 118cc combustion chambers |
| Valve Diameters: | 2.19” intake, 1.88” exhaust |
| Camshaft: | P/N 24502611 high-performance hydraulic roller tappet |
| Valve Lift: | .511” I, .540” E |
| Valve Springs: | P/N 14097002 |
| Valve Lash: | Net Lash |
| Camshaft Duration: | 211° I, 230° E at .050” tappet lift |
| Rocker Arms: | P/N 12523976 1.7:1 ratio |
| Flex Plate: | P/N 10185034 14” for automatic transmission |
| Timing Chain: | P/N 10114177 Single roller |
| Damper: | P/N 10216339 8” |
| Intake Manifold: | Aluminum high-rise, for Holley four-barrel |
| Oil Pan: | 6 quart with windage tray |
| Oil Pres. (Normal): | 40psi @ 2000 rpm |
| Oil Pump Drive: | P/N 3860365 Shaft and P/N 3764554 Sleeve |
| Fuel: | 92 Octane |
| Fuel Pres. Required: | 5 to 8.5psi |
| Spark Plugs: | MR43T Gap .045 HEI or .035 for STD distributor |
| Spark Timing: | 4° BTDC |
| Technical Notes: For manual transmission applications, use flywheel P/N 14096987 and a suitable 11” clutch assembly. Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts. | |
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PARTS THAT WILL WORK WITH THE 454 HO | |
| High Torque Mini Starter: | High Power, compact design P/N 123361146 |
| HEI Distributor: | P/N 1104067 |
| Air Cleaner: | Chevrolet Logo 14” Hi Performance Air Cleaner P/N 12342080 |
| Roller Rocker Arms: | 1.7:1 ratio full roller design (Qty. 16) P/N 12361323 |
| Stud Package: | Rocker Arm Stud Kit (Qty. 16) P/N 12495518 |
| Valve Covers: | Tall Chrome, provides clearance for roller rocker arms. P/N 12342099 |
| Spark Plug Wires: | Chevrolet Logo 8mm High Performance P/N 12361052 |
| Oil Pan: | 4 Quart P/N 12495360 |
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