ATK HP80M Ford 347 Stroker 410 HP Stage 2 Aluminum Head Crate Engine

Description

Eliminate complicated small-block valvetrain setup with the ATK HP80M Crate Engine in Stage 2 mid-dress configuration. Producing 410 horsepower at 5,800 RPM and 400 lb-ft torque at 4,200 RPM, this 347 cubic inch Windsor V8 arrives with an aluminum intake, distributor, water pump, and balancer. It permits car builders to select personalized carburetors or electronic fuel injectors.

A rigid cast iron Ford Windsor block provides stable foundation support, cast with a leak-resistant 1-piece rear main seal. The reciprocating kit incorporates a 4340 forged steel 3.400-inch stroke crankshaft, 5.400-inch forged rods, and 10.2:1 forged pistons inside 4.030-inch bores. An external 28-ounce imbalance configuration combines with a dual-sump steel oil pan to manage oil reserves under fierce acceleration.

Key Features of ATK HP80M

Performance builders buy ATK HP80M crate engine assemblies to drop proven small-block stroker power into project cars while personalizing fuel induction components. The mid-dress configuration powers high-speed street rods, drag racers, and classic muscle cruisers.

• Dual-plane aluminum intake manifold comes torqued in place to eliminate intake runner vacuum leaks under heavy load.
• 190cc aluminum intake ports maximize airflow velocity to feed oversized combustion chambers under continuous track acceleration.
• 2.02-inch intake and 1.60-inch exhaust valves promote swift cylinder clearing without thermal exhaust backpressure.
• 0.544-inch lift hydraulic roller camshaft generates massive cylinder pressures across an expansive 2,500 to 6,000 RPM powerband.
• 1.6:1 ratio roller rocker arms stabilize valve actuation without pushrod deflection under high valvetrain stress.
• ATK HP80M mid-dress components feature a cast iron water pump with factory small-block Ford belt pulley dimensions.
• Electronic distributor provides stable ignition advance curves to burn compressed fuel charges under load.
• Harmonic balancer with an external 28-ounce imbalance weight arrives installed to streamline front accessory installation.

Combustion Dyno Performance Metrics

Dynamometer calibration tests verify 410 horsepower at 5,800 RPM and 400 lb-ft torque at 4,200 RPM across an effective 2,500 to 6,000 RPM range. The 10.2:1 compression ratio operates safely on 91-octane premium gasoline. Cam duration provides 13 in-Hg manifold vacuum at 850 RPM idle speeds. The internal oil system regulates warm oil pressure between 45 and 65 PSI.

Chassis Clearances Bellhousing Integration

External block dimensions match standard Ford Windsor profiles, clearing crossmembers and shock towers in classic Mustang platforms. The 28-ounce imbalance rear crank flange connects straight to matching Ford flexplates or flywheels. Motor mount pads line up with factory Ford frame stands, clearing steering linkages and large-tube headers without chassis cutouts.

Pre-Lube Protocol Service Cautions

Prime internal oil galleries using a dedicated pre-lube rod until fresh lubricant pools around every rocker arm pivot before starting. Use mineral-based 10W-30 break-in oil containing high ZDDP additives to coat bearing surfaces during initial running cycles. This power plant is not engineered for marine bilge setups, forced induction past 6 PSI, or unmetered nitrous shots.

• Replace the initial break-in oil and install a high-flow oil filter after the first 500 operating miles.
• Inspect intake manifold hold-down bolts and examine coolant hose clamps every 3,000 miles of street use.
• Check valve lash clearances and inspect harmonic balancer integrity every 12 months or 12,000 miles.

Warranty Terms Shipping Manifest

ATK covers the engine with a 12-Month limited warranty for authorized recreational and street performance vehicle applications. The reinforced crate holds the assembled engine, aluminum intake manifold, water pump, distributor, harmonic balancer, oil pan, valve covers, and engine dynamometer report.