Chevrolet Performance 502 HO 461 HP Long Block Crate Engine — GM Part #19433157

Factory-built 8.2 liters of big-block torque. The Chevrolet Performance 502 HO crate engine (GM Part #19433157) is a genuine GM long block delivering 461 horsepower at 5100 RPM and 558 lb-ft of torque at 3400 RPM from 502 cubic inches of Chevrolet Gen VI big-block architecture. This is not a generic rebuild — it is a brand-new, factory-assembled long block built on GM’s latest-generation cast-iron 4-bolt main block with an all-forged rotating assembly, hydraulic roller camshaft, and iron rectangular-port cylinder heads. At NH Race Engines, we are an authorized EU source for genuine Chevrolet Performance crate engines. The 19433157 ships directly from our Netherlands warehouse with full GM warranty, dyno documentation, and no import surprises.

Why Choose the GM 502 HO Long Block Crate Engine?

The 19433157 is Chevrolet Performance’s value-driven answer to the question: “What is the most torque I can get on pump gas without breaking the bank?” The answer is 558 lb-ft at just 3400 RPM — and nearly 500 lb-ft is available from as low as 1500 RPM. cite🛠web_search:12#3:~:text>it makes nearly 500 lb.-ft. by only 1,500 rpm

Unlike a 454 rebuild that requires hunting down a usable core, machining, and sourcing parts, the 19433157 arrives as a complete, brand-new long block. GM has already selected, matched, and assembled every internal component:

Brand-New GM Gen VI Block: The 19433157 starts with a fresh GM cast-iron block (P/N 19170540) featuring four-bolt main caps, priority main oiling, and a one-piece rear main seal. This is not a seasoned core — it is a current-production casting with the latest improvements in block rigidity and oil flow. cite🛠web_search:12#5:~:text>Block (P/N 19170540): Cast-iron with 4-bolt main caps

All-Forged Rotating Assembly: Forged steel crankshaft (P/N 10183723), forged steel shot-peened connecting rods (P/N 19170198), and forged aluminum pistons (P/N 12533507). This is the same bottom-end hardware GM uses in its highest-horsepower big-block crate engines — rated for well beyond the 502 HO’s 461 HP. cite🛠web_search:12#5:~:text>Crankshaft (P/N 10183723): Forged steel…Connecting Rods (P/N 19170198): Forged steel, shot peened…Piston and Ring Kit (P/N 12533507): Forged aluminum

Hydraulic Roller Camshaft: A modern hydraulic roller cam (P/N 24502611) with 0.510-inch intake / 0.540-inch exhaust lift and 211°/230° duration at 0.050-inch. The roller design eliminates periodic valve-lash adjustment, reduces valvetrain wear, and delivers a 100,000-mile service life — all while producing a muscular idle and a broad torque curve. cite🛠web_search:12#5:~:text>Camshaft Type (P/N 24502611): Hydraulic roller…Camshaft Lift (in): .510 intake / .540 exhaust…Camshaft Duration (@.050 in): 211° intake / 230° exhaust

Iron Rectangular-Port Heads: GM rectangular-port cast-iron cylinder heads (P/N 12562920) with 118cc combustion chambers, 2.19-inch intake valves, and 1.88-inch exhaust valves. These are the same high-flow heads that powered GM’s highest-horsepower production big-blocks. The iron construction provides excellent heat dissipation and detonation resistance with the 8.75:1 compression ratio. cite🛠web_search:12#5:~:text>Cylinder Heads (P/N 12562920): Iron rectangular port; 118cc chambers…Valve Size (in): 2.190 intake / 1.880 exhaust

8.75:1 Pump-Gas Compression: The conservative 8.75:1 compression ratio means the 502 HO runs on regular pump gasoline at all altitudes and engine loads — no race fuel, no octane boosters, no worries. This is an engine designed for real-world driving across the EU. cite🛠web_search:12#5:~:text>Compression Ratio: 8.75:1…Recommended Fuel: Regular pump

Externally Balanced with 14-Inch Flexplate Included: The 19433157 includes an externally balanced 14-inch automatic transmission flexplate (P/N 10185034), harmonic balancer, timing cover, cast-iron long-style water pump, and aluminum dual-plane intake manifold (P/N 19131359). You supply the carburetor, distributor, starter, and fuel pump — that is it. cite🛠web_search:12#5:~:text>Flexplate (P/N 10185034): 14″…Balanced: External…Intake Manifold (P/N 19131359): Dual Plane…Water Pump (P/N 19168606): Cast-iron, long-style

Key Features & Benefits

502 Cubic Inches (8.2L) Gen VI Big-Block: The largest production-based V8 Chevrolet ever built. The 4.470-inch bore x 4.000-inch stroke combination delivers effortless torque from idle to redline. At 558 lb-ft, the 502 HO makes more peak torque than a factory 454 LS6 — and it does so on pump gas with a hydraulic roller cam. cite🛠web_search:12#5:~:text>Displacement (cu in): 502…Bore x Stroke (in): 4.470 x 4.000

461 Horsepower at 5100 RPM: Smooth, reliable power achieved through displacement and airflow. The 461 HP rating is conservative — many builders see 470+ HP with a free-flowing exhaust and proper tuning. Redline is 5500 RPM, making this a street-friendly engine that does not require constant high-RPM operation to deliver its power. cite🛠web_search:12#5:~:text>Horsepower: 461 HP…Maximum Recommended rpm: 5,500

558 lb-ft Torque at 3400 RPM: The defining characteristic of the 502 HO. This is stump-pulling, trailer-towing, tire-smoking torque that peaks at a street-friendly 3400 RPM. With nearly 500 lb-ft available at just 1500 RPM, the 502 HO pulls like a diesel from idle — then keeps pulling all the way to redline. cite🛠web_search:12#5:~:text>Torque: 558 lb.-ft. @ 3,400 rpm

8.75:1 Compression Ratio: Forged aluminum pistons with a pump-gas-friendly 8.75:1 compression ratio ensure reliable operation on regular unleaded throughout the EU. Detonation-resistant, altitude-tolerant, and built for real-world driving conditions without requiring premium fuel. cite🛠web_search:12#5:~:text>Compression Ratio: 8.75:1…Recommended Fuel: Regular pump

Cast-Iron Rectangular-Port Cylinder Heads: GM rectangular-port heads (P/N 12562920) with 118cc open chambers, 2.19-inch intake valves, and 1.88-inch exhaust valves. These heads flow significantly more than oval-port castings and provide the airflow needed to feed 502 cubic inches. The iron construction is durable, cost-effective, and thermally stable.

Hydraulic Roller Camshaft: Modern roller lifters on a steel billet core deliver 0.510-inch / 0.540-inch lift with 211°/230° duration at 0.050-inch. The result is a muscular idle, strong mid-range torque, and reliable high-RPM operation without the maintenance demands of a solid-lifter cam. No valve-lash adjustment. No break-in oil required after initial run-in. cite🛠web_search:12#5:~:text>Camshaft Lift (in): .510 intake / .540 exhaust…Camshaft Duration (@.050 in): 211° intake / 230° exhaust

Aluminum Dual-Plane Intake Manifold Included: The GM Performance Parts dual-plane intake (P/N 19131359) is engineered specifically for the 502’s bore spacing and is included with the long block. It optimizes velocity for low-end torque while providing enough plenum volume to feed 461+ HP. Designed for a square-bore carburetor. cite🛠web_search:12#5:~:text>Intake Manifold (P/N 19131359): Dual Plane

4-Bolt Main Gen VI Block: The latest-generation GM block features four-bolt main caps on all five journals, priority main oiling, and a one-piece rear main seal. This is a stronger, more refined foundation than any factory 454 block ever produced.

Forged Steel Crankshaft & Rods: A 4.000-inch stroke forged steel crank with 2.200-inch rod journals, paired with forged steel shot-peened connecting rods. This rotating assembly is rated for well beyond 550 lb-ft — providing a substantial safety margin for the 502 HO’s output. cite🛠web_search:12#5:~:text>Crankshaft (P/N 10183723): Forged steel…Connecting Rods (P/N 19170198): Forged steel, shot peened

Stamped Steel 1.7:1 Rocker Arms: Stamped steel rocker arms (P/N 19260993) with a 1.7:1 ratio provide reliable valvetrain operation. Roller rocker upgrades are available for builders seeking reduced friction and higher-RPM capability. cite🛠web_search:12#5:~:text>Rocker Arms (P/N 19260993): Stamped steel…Rocker Arm Ratio: 1.7:1

Clutch Linkage Bosses Drilled & Tapped: Unlike earlier crate engines, the 19433157 comes with clutch linkage bosses pre-drilled and tapped — ready to accept your clutch pivot ball for manual transmission applications. cite🛠web_search:12#5:~:text>Clutch linkage bosses are now drilled and tapped

Mechanical Fuel Pump Boss Drilled: The block includes a drilled mechanical fuel pump boss with a fuel pump lobe on the camshaft — allowing simple mechanical fuel pump installation without electric pump complexity. cite🛠web_search:12#5:~:text>502 engines now have a mechanical fuel pump boss! NOTE: There is a fuel pump lobe behind the boss.

Technical Specifications

What’s Included — Complete Long Block

The Chevrolet Performance 19433157 is delivered as a fully assembled long block. GM has already machined, balanced, and assembled every component:

• GM Gen VI cast-iron block (P/N 19170540) — 4-bolt main caps, priority oiling
• Forged steel crankshaft (P/N 10183723) — 4.000″ stroke, externally balanced
• Forged steel shot-peened connecting rods (P/N 19170198)
• Forged aluminum pistons with rings (P/N 12533507)
• Hydraulic roller camshaft and roller lifters (P/N 24502611)
• Cast-iron rectangular-port cylinder heads (P/N 12562920) — 118cc chambers, assembled
• Stamped steel 1.7:1 rocker arms (P/N 19260993)
• Double-roller timing chain and gears
• Timing cover and harmonic balancer
• Rear-sump oil pan, pickup tube, and windage tray
• Cast-iron long-style water pump (P/N 19168606)
• Aluminum dual-plane intake manifold (P/N 19131359)
• 14-inch externally balanced flexplate (P/N 10185034)
• Black valve covers with breathers
• Spark plugs
• GM build sheet and warranty documentation

What You Will Need to Add (Not Included)

Because the 19433157 is a long block, your remaining to-do list is straightforward:

• Carburetor: Square-bore 4-barrel — Holley 750–850 CFM recommended for 502 ci
• Distributor: HEI or ready-to-run distributor with melonized steel gear (mandatory — see note below)
• Starter: High-torque mini starter recommended for header clearance
• Fuel Pump: Mechanical fuel pump (boss is drilled with cam lobe) or electric pump
• Ignition System: Spark plug wires, coil, and ignition box if not using HEI
• Exhaust System: 2-1/8″ or 2-1/4″ long-tube headers and 3-inch dual exhaust
• Radiator & Hoses: Heavy-duty 4-core radiator with big-block upper/lower hoses
• Flywheel (Manual Trans): GM Flywheel P/N 14096987 with 11-inch clutch assembly
• Engine Mounts: Big-block frame stands for your specific chassis
• Transmission: TH400, 4L80E, TKO 600, or Tremec Magnum with correct bellhousing

Critical Distributor Note: A distributor with a melonized steel gear MUST be used with this long block. The hydraulic roller camshaft is steel, and a standard bronze or iron distributor gear will fail rapidly, causing catastrophic engine damage. Use only a melonized steel gear distributor. cite🛠web_search:12#5:~:text>Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.

Exhaust Manifold Note: When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads for clearance. cite🛠web_search:12#5:~:text>When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance

Long Block vs. Dressed Crate Engine — Why the 19433157?

Ideal Applications for the 502 HO 19433157

The Chevrolet Performance 502 HO is designed for pre-1976 street vehicles and off-road applications. NH Race Engines ships the 19433157 for these popular builds across the EU:

1964–1972 Chevrolet Chevelle & El Camino: The 502 HO drops into any big-block Chevelle chassis with factory frame stands. The 558 lb-ft of torque transforms a mild cruiser into a street machine. Correct rear-sump oil pan positioning. A 2-inch cowl hood is recommended for intake clearance.

1967–1969 Chevrolet Camaro: The ultimate first-gen Camaro upgrade. The 502 HO delivers more torque than a factory 454 LS6 with modern hydraulic-roller reliability. Requires big-block heater hose routing, subframe connectors, and a 12-bolt or Ford 9-inch rear end. A cowl hood is strongly recommended.

1968–1972 Chevrolet Nova: The compact Nova with a 502 is a legendary sleeper. Rear-sump pan clears Nova crossmembers. Be prepared to upgrade rear suspension — 558 lb-ft will twist stock leaf springs.

1965–1976 Chevrolet Impala, Caprice & Bel Air: Full-size Chevys that originally ran 396, 427, or 454. The 502 HO is a direct replacement with factory motor mounts. Perfect for boulevard cruisers and highway eaters.

1967–1991 C10 / C20 / C30 / K10 / K20 Trucks: Classic Chevy pickups and Suburbans. The 502 HO delivers massive towing torque. Front-sump oil pan and truck accessory drive available. Factory big-block springs and sway bars required.

Off-Road & Competition: The 19433157 is designed for off-road vehicles and dedicated competition builds. The all-forged rotating assembly and 4-bolt main block handle the abuse of mud bogs, sand drags, and pulling trucks. Not intended for marine use. cite🛠web_search:12#5:~:text>Designed for pre-1976 street vehicles or any off-road vehicle…Not intended for marine applications

Important Fitment & Compatibility Notes

Distributor Gear Requirement: This cannot be overstated — the 19433157 uses a steel hydraulic roller camshaft. You MUST use a distributor with a melonized steel gear. A standard bronze or iron gear will destroy itself within minutes, sending metal debris through the engine. Melonized steel gear distributors are available from GM Performance, MSD, and most major ignition brands. cite🛠web_search:12#5:~:text>Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.

External Balance: The 502 HO is externally balanced. The included 14-inch flexplate is correct for TH400, 4L80E, and other automatic transmissions. For manual transmission applications, you MUST use GM flywheel P/N 14096987 with an 11-inch clutch assembly. Do not use a neutral-balance or 454-style flywheel — severe vibration and bearing damage will result. cite🛠web_search:12#5:~:text>Comes with an externally balanced 14″ automatic transmission flexplate. Use flywheel P/N 14096987 and 11″ clutch assembly for manual transmission applications

Hood Clearance: The 502 uses a tall-deck block. The aluminum dual-plane intake and carburetor add significant height. A 2-inch cowl-induction hood is the minimum recommendation for 1967–1969 Camaros and 1968–1972 Novas. 1970–1972 Chevelles with factory cowl-induction hoods typically have adequate clearance.

Cooling Requirements: The 502 HO generates significant heat. A minimum 4-core aluminum radiator with dual 16-inch electric fans or a high-flow mechanical fan is required. A small-block radiator will not provide adequate cooling.

Transmission & Driveline: The 558 lb-ft of torque will destroy a TH350 or 10-bolt rear end. We strongly recommend a TH400, 4L80E, TKO 600, or Tremec Magnum. The rear axle should be a 12-bolt with 33-spline axles, a Ford 9-inch with 35-spline axles, or a Dana 60.

Frame & Suspension: The 502 weighs approximately 650–680 lbs dressed. Factory big-block springs, sway bars, and subframe connectors are mandatory on unibody cars. Tubular control arms are recommended for Pro-Touring builds.

Brakes: A 461 HP 502 demands modern stopping power. Front disc brakes with 12-inch rotors and four-piston calipers are the minimum. Power brakes with a vacuum reservoir are recommended.

Carburetor Sizing: For 502 cubic inches, a 750–850 CFM square-bore carburetor is ideal. The Holley 0-4779 (750 CFM double-pumper) or 0-4781 (850 CFM double-pumper) are popular choices. Vacuum-secondary carbs are also suitable for street-driven builds seeking smoother part-throttle response.

Installation & Break-In Notes

Hydraulic Roller Cam Break-In: The 19433157 uses a hydraulic roller camshaft, so break-in is straightforward. Use conventional 10W-40 motor oil with a ZDDP break-in additive (such as Comp Cams #159) for the first 500 miles. After break-in, switch to synthetic 10W-40 or 15W-50 for maximum protection.

Break-In Procedure: Start the engine and immediately bring RPM to 2,000–2,500. Hold for 20–30 minutes while varying RPM and monitoring oil pressure (minimum 45 PSI hot) and coolant temperature. Do not idle for extended periods during break-in. After 20–30 minutes, allow the engine to cool completely, then change the oil and filter.

Timing: Set total timing to 32 degrees at 4000 RPM with the vacuum advance disconnected. Reconnect vacuum advance to manifold vacuum (not ported) after timing is set for improved idle quality. cite🛠web_search:12#5:~:text>Ignition Timing: 32° Total at 4,000 rpm

Spark Plug Gap: 0.045 inch with the included spark plugs or equivalent AC Delco R45TS. The 502 HO’s cylinder pressure benefits from a slightly wider gap than a typical small-block.

Stall Converter: A stock 1,800–2,000 RPM stall converter is adequate for the 502 HO’s mild hydraulic roller cam. For improved launch performance, a 2,400–2,800 RPM stall is recommended with the TH400.

Recommended Companion Products

Complete your 502 HO 19433157 build with these NH Race Engines recommended add-ons:

Holley 850 CFM Double-Pumper Carburetor (0-4781): The ideal carburetor for 502 cubic inches. Mechanical secondaries, dual feed, and center-hung floats. Sized perfectly for the 502 HO’s airflow demands.

MSD Pro-Billet Distributor with Melonized Steel Gear: Mandatory for the 502 HO’s steel roller cam. The MSD 85551 or equivalent with melonized gear ensures long distributor and camshaft life. Do not substitute a bronze or iron gear distributor.

Hooker Super Competition Headers: 2-1/8 inch long-tube headers for 1964–1972 Chevelle, 1967–1969 Camaro, and 1968–1972 Nova big-block applications. Ceramic coating recommended.

Aluminum Radiator with Dual Electric Fans: High-capacity direct-fit radiator for big-block Chevy applications. Ensures adequate cooling for the 502 HO’s heat load.

TH400 or 4L80E Transmission: Heavy-duty 3-speed or overdrive 4-speed automatic. Rated for 600+ lb-ft and bulletproof reliability behind a 502 big-block.

12-Bolt Posi-Traction or Ford 9-Inch Rear End: 3.73 or 4.10 gears with 33-spline (12-bolt) or 35-spline (9-inch) axles. Essential for putting 558 lb-ft to the pavement.

High-Torque Mini Starter: Compact gear-reduction starter with increased cranking speed. Required for header clearance and reliable hot-start performance.

GM Flywheel P/N 14096987 (Manual Trans): Externally balanced flywheel for manual transmission applications. Paired with an 11-inch clutch assembly. Do not use a 454-style neutral balance flywheel.

ARP Engine Bolt Kit: Complete 12-point and hex-head bolt kit for intake, exhaust, timing cover, oil pan, valve covers, and harmonic balancer.

2-Inch Cowl-Induction Hood: Required for tall-deck intake and air cleaner clearance on most applications. Available in steel or fiberglass for 1964–1972 GM muscle cars.

Why Buy the 19433157 from NH Race Engines?

• Authorized Chevrolet Performance EU Dealer: Genuine GM crate engine with full Chevrolet Performance warranty and build documentation
• Fast EU Shipping: Crate engines ship via freight carrier from our Netherlands warehouse — Netherlands 5–7 days | Germany, Belgium, France 7–10 days | Rest of EU 10–14 days
• No Import Surprises: All duties, customs clearance, and VAT handled — you pay the price you see, nothing more
• Technical Support: Our team understands Gen VI architecture, external balance requirements, melonized distributor gear compatibility, and tall-deck hood clearance
• Complete Build Guidance: We help you select the correct carburetor, distributor, transmission, and rear axle for your specific 502 HO application
• Genuine GM Parts: Every 19433157 is a factory-fresh Chevrolet Performance engine — not a rebuild, not a clone, not a generic crate motor

Popular 502 HO 19433157 Searches

Customers browsing the Chevrolet Performance 502 HO 19433157 also search for:

19433157 Crate Engine |
502 HO 461 HP Engine |
Chevrolet Performance 502 Long Block |
GM 502 HO for Sale EU |
502 Big Block Long Block |
19433157 vs 12568778 |
502 HO Engine Specs |
Chevy 502 Iron Head Engine |
502 Engine for Chevelle |
502 Engine for Camaro |
502 Engine for C10 |
558 lb-ft Torque Engine |
8.2L Chevy V8 Long Block |
GM Performance Crate Engine EU |
All 502 Big Block Engines