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12568778 - GM 502 HO 502CID 450HP Crate Engine

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There is no replacement for displacement, and torque is the king. With 550 Ft/Lbs of torque the 502 HO will launch your car harder than you thought possible.

With its 450 horsepower and awesome torque the 502 HO may have the best power to dollar ratio going. If your car is all steel, you'll appreciate the power of the 502 HO and if your car is a light weight racer, say 2300 pounds, the 550 Ft/Lbs of torque will put a big ol' grin on your face. This engine is awesome.

Starting with a Gen VI 4-bolt main block, we fill it with forged pistons, forged 4340 steel connecting rods with 7/16" bolts, a 1053 forged steel crankshaft, and a steel roller camshaft. Then we torque down a pair of big breathing rectangular port heads with 2.19" intake and 1.88" exhaust valves. With their 118cc combustion chambers yielding a streetable 8.75 to 1 compression ratio, this engine is ready to rock on readily available pump premium. We then top it all off with an aluminum dual plane intake manifold and dress the engine with a cast iron water pump, 6 quart oil pan, windage tray, 14" flexplate and harmonic balancer. So, all you need to do is provide a 750 cfm carb, HEI ignition system, headers with 2" X 30" primaries and low restriction mufflers and a car with big sticky tires. Sounds simple, and it is!

Check with us for specific oil pan needs for your application. The 502 HO is not intended for marine use, and should only be used in 1973 and earlier pre-emissions street vehicles or any year off road vehicles.

Power: 450 HP @ 52500 RPM, 550 ft. lbs. of torque @ 3500 RPM
Displacement: 502 CID
Bore x Stroke: 4.47” x 4.000”
Compression Ratio: 8.75:1
Recommended Fuel: 92 Octane
Block: Cast Iron, 1 piece rear seal, 4-bolt main caps
Crankshaft: Forged Steel
Connecting Rods: Forged Steel
Pistons: Forged Aluminum
Camshaft: Steel Hydraulic Roller Tappet
Cam Lift: .510” Intake / .540” exhaust
Cam Duration @ .050”: 211 deg. Intake / 230 deg. Exhaust
Lobe Separation: 112 Degree
Cylinder Heads: Cast Iron Rectangular Port
Combustion Chamber: 118cc
Valves: 2.190” Intake/ 1.880” Exhaust
Rocker Arms: Stamped Steel, 1.7:1 Ratio
Balance: External
Maximum GM Recommended RPM: 5500
Ignition Timing: Base 4 degrees BTDC, 26 degrees total

Engine Includes:
• Fully GM assembled long block
• Black Cast Aluminum Valve Covers
• Aluminum Intake Manifold
• Oil pump, pick-up and oil pan
• Spark Plugs
• 14” Auto Trans Flexplate
• 8” Harmonic Balancer
• Front timing cover
• Cast Iron Long Water Pump
• Oil Filter and Adapter
• Passenger Side RH Oil Dipstick and Tube

General Motors limited 2 year / 50,000 mile parts & labor warranty. Click on Document tab above for full details.

Related Engines:
GM 502 450HP Crate Engine
GM 502 600+HP Fully Assembled Crate Engine
GM Big Block Serpentine Accessory Drive System

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  • Item Requires Shipping
  • 710.0 lbs.
  • W27.0000” x H26.5000” x L30.5000”
  • Free Shipping!
  • FREE 48 State Truck Freight Shipping (International shipping will require freight quote)

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