GMP-4L80E502HO - GM 502HO 450HP Engine with PAGM 4L80E Trans

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Availability: Discontinued
Shipping: FREE 48 State Shipping
Pricing: $10,989.88


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.

4L80E 4 Speed with overdrive transmission package designed for use with Chevrolet Performance BBC 502HO 450HP crate engine.

Performance Automatic in its never ending quest to stay on top of today’s need for modern day transmission packages has come up with an addition to its popular Street Smart Packages. The PAGM Series Street Smart Systems are exclusively designed to complement selected GMPP Crate Engines. The GMPP Crate Engines have been increasingly popular with Street Rodders and Muscle Car enthusiasts alike. Performance Automatic has developed customized overdrive transmission packages and has made it easy to pick a combination for your vehicle. The PAGM Series Packages have been designed for both performance and street ability. These kits also include all the necessary transmission components to complete the installation.

The PAGM kits utilized electronic, 4L80E, 4L70E and 4L60E, and non-electronic 700R4 overdrive transmissions. All of the PAGM electronic transmission packages come complete with the “Smart Shift” transmission controller and matching wiring harness for a” plug in and go, no laptop required “ installation. The Street Smart Converters are designed to give that “stop light to stop light” performance and to stretch that tank full of gas running down the highway in lock up. The PAGM series also provides you with a complete hardware kit consisting of all the nuts and bolts needed for your particular combination.

Performance Automatic PAGM series transmissions specifically designed and tuned for use behind most of the Chevrolet Performance crate engines. The PAGM transmissions include the proper torque converter, beefed-up internal components, shift patterns and pressures to match the Chevrolet Performance crate engines cam profile, HP rating, torque curve and RPM range. Each transmission is dyno tested.

PAGM Transmission Package Includes :

• HD 4L80E transmission
• Torque Converter
• Transmission Dipstick and Tube
• Performance Automatic Smart Shift trans controller
• Converter Dust Shield
• HD Transmission Mount
• HD Aluminum Pan
• TPS and Harness for use with carbureted engines
• Speedo Sensor
• Complete mounting hardware kit and instructions

Performance Automatic PAGM limited 2 year warranty. Click on Document tab above for full details.

Application List



  • GMP-4L80E502HO
  • GMP-4L80E502HO
  • PACE Performance
  • Discontinued
  • New


Shipping Information

  • Item Requires Shipping
  • 500.0 lbs.
  • FREE 48 State Shipping

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