Don’t bother repowering your trusty Big-Block-powered truck with a rebuild or reconditioned used engine. Our HT502 crate engine is an affordable alternative with more power and greater durability, including a whopping 541 lb.-ft. of trailer-tugging torque. That’s more than the factory ever offered and more than you’ll get with a stock-type rebuild.

It is uniquely suited to pre-1978 trucks, but is adaptable to a variety of applications, and it’s built with our latest generation block casting with four-bolt main caps. An all-forged rotating assembly delivers exceptional strength and durability, while a mild 8.75:1 compression ratio is suitable for regular pump gasoline at all altitudes and engine loads.

Our assembly comes with the heads and a balancer installed. An induction system, ignition, starter, water pump and other accessories are required to finish the engine. All necessary components are available from Chevrolet Performance.

Engine Package Includes:

8” Harmonic Balancer
Oil Filter Adapter
Oil Filter
Premium Cast Aluminum Valve Covers
14" Externally balanced 168-tooth automatic transmission flexplate
Oil dipstick and tube


Power: 406 HP @ 4200 RPM, 541 ft. lbs. of torque @ 3200 RPM
Displacement: 502 CID
Bore x Stroke: 4.470” x 4.000”
Compression Ratio: 8.75:1
Recommended Fuel: 87 Octane
Block: Cast Iron, 1-piece rear seal, 4-bolt main caps
Crankshaft: Forged Steel
Connecting Rods: Forged Steel
Pistons: Forged Aluminum
Camshaft: Hydraulic Roller
Cam Lift: .480” Intake / .483” exhaust
Cam Duration @ .050”: 204 deg. Intake / 209 deg. Exhaust
Cylinder Heads: Cast Iron Oval Port
Combustion Chamber: 118cc
Valves: 2.07” Intake/ 1.73” Exhaust
Rocker Arms: Stamped Steel, 1.7:1 Ratio
Balance: External
Maximum GM Recommended RPM: 5500
GM Recommended Torque Convertor Stall: 3000 to 3400 Stall Speed
Ignition Timing: Base 10 degrees BTDC, 34 degrees total @ 4000RPM

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Big Block Chevy 502 406HP Long Block Crate Engine 88890534

Product Information

  • $6,446.87

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