ATK HP09M Ford 351W 300HP Stage 2 Mid-Dress Long Block Crate Engine

Description

During heavy highway towing trips the ATK HP09M Ford Crate Engine Mid-Dress Windsor package outputs uninterrupted small-block pulling power. Producing 300 brake horsepower at 5,000 RPM, this 5.8-liter V8 repowers classic Ford trucks, Broncos, and vans. Equipped with an intake manifold, distributor, water pump, balancer, and flexplate, it eliminates tedious accessory matching for busy restoration builders.

Engine builders start with a seasoned Ford 351W cast iron block, line-honing main journals and squaring deck surfaces. A nodular cast iron crankshaft spins with external 28-ounce imbalance weighting inside a one-piece rear main seal structure. Forged steel connecting rods mate to 4.000-inch hypereutectic pistons across a 3.500-inch stroke. An 8.8:1 compression ratio pairs with cast iron cylinder heads. Wet sump oil capacity holds 5.0 quarts. Dry long block weight registers at 475 lbs.

Key Features of ATK HP09M Mid-Dress

Fleet mechanics and restomod builders buy ATK HP09M Mid-Dress crate engine units to simplify engine swaps with verified component compatibility. This mid-dress long block drops flush into vintage Ford engine compartments using stock chassis pads.

• 351 cubic inch displacement provides immense low-end torque for heavy vehicle operation.
• OE hydraulic roller camshaft profiles reduce valvetrain friction while extending component lifespan.
• Cast iron cylinder heads feature induction-hardened exhaust valve seats for modern unleaded fuels.
• Dual-plane carbureted intake manifold ensures balanced air-fuel distribution across all cylinders.
• Electronic distributor provides accurate spark timing across the entire RPM range.
• External 28-ounce harmonic balancer counters torsional vibration during sudden acceleration spikes.
• Pre-installed automatic transmission flexplate simplifies drivetrain integration with classic Ford transmissions.
• Balanced ATK HP09M Mid-Dress rotating parts protect main bearings under continuous heavy load.

Dynamic Windsor Stroker Dyno Output

Operating across an effective 1,800 to 5,200 RPM power band, this mid-dress Windsor long block produces 300 brake horsepower and 380 lb-ft torque on standard 87-octane pump gasoline. The OE hydraulic roller camshaft specifies 206 degrees intake duration at 0.050-inch lift with 0.445-inch valve lift. Manifold vacuum measures 18 in-Hg at a 650 RPM curb idle. Hot engine oil pressure runs between 45 to 65 PSI, keeping crankshaft journals and valvetrain parts lubricated during extended highway cruising and trailer hauling.

Engine Bay Subframe Fitment Clearances

This 351 Windsor engine utilizes standard Ford small-block bellhousing patterns, bolting straight to C6, AOD, and manual transmissions. The included 28-ounce external balance flexplate accommodates automatic converters. Factory motor mount bosses align with stock truck frame pads. The front-sump oil pan clears steering linkages and suspension crossmembers without chassis modifications.

Break-In Protocol Maintenance Duty Limits

Pre-lube engine oil galleries with high-zinc 10W-30 mineral oil using a mechanical primer before initial starter cranking. Fill and bleed coolant through the thermostat housing to eliminate trapped air pockets. This engine package is not engineered for supercharger boost exceeding 5 PSI, nitrous oxide systems, or raw marine sea water cooling.

• Drain break-in motor oil after the first 50 road miles.
• Renew conventional or synthetic motor oil every 3,000 miles.
• Inspect ignition timing, distributor advance, and spark plugs every 12 months.

Warranty Coverage Pallet Crate Manifest

A 12-Month limited warranty protects against material and manufacturing defects. The banded wooden pallet crate houses the mid-dress long block, intake manifold, distributor, water pump, harmonic balancer, flexplate, oil pan, valve covers, dyno verification sheet, and installation guide. Components ship sealed in vapor-barrier plastic wrap against moisture.