ATK HP100M Ford 347 Stroker 450HP Stage 2 Mid-Dress Crate Engine

Description

Forged steel rotating components reinforce the ATK HP100M Ford Crate Engine Mid-Dress Windsor package. Engineered for classic Mustangs, Fairlanes, and lightweight Cobra kit cars, this 5.7-liter stroker V8 produces 450 brake horsepower at 6,000 RPM. Complete with aluminum cylinder heads, dual-plane intake, distributor, water pump, balancer, flexplate, and flywheel, this package streamlines performance engine installation.

Machinists start with a seasoned Ford cast iron block, clearance-notching the cylinder skirts for stroker connecting rod swing. A 4340 forged steel stroker crankshaft spins with external 28-ounce imbalance weighting inside a two-piece rear main seal. Forged 4340 I-beam connecting rods attach to 4.030-inch forged aluminum pistons through a 3.400-inch stroke. A 10.0:1 compression ratio pairs with high-breathing aluminum cylinder heads. Oil capacity holds 5.0 quarts. Dry long block weight totals 432 lbs.

Key Features of ATK HP100M Mid-Dress

Restomod builders buy ATK HP100M Mid-Dress crate engine packages to secure high-flow aluminum head stroker output with verified valvetrain components. The long block installs flush into vintage Ford engine bays using stock frame mount perches.

• 3.400-inch stroker crankshaft expands displacement to 347 cubic inches for intense acceleration.
• High-flow aluminum cylinder heads maximize volumetric efficiency while shedding front-end mass.
• Retro-fit hydraulic roller camshaft profile generates aggressive valve lift for high-RPM power.
• Dual-plane aluminum intake manifold optimizes air-fuel mixture velocity into combustion chambers.
• Electronic billet distributor provides reliable ignition timing across the entire 6,000 RPM range.
• External 28-ounce harmonic balancer counters destructive crankshaft torsion during hard launches.
• Included flexplate and flywheel accommodate either automatic or manual transmission setups.
• Balanced ATK HP100M Mid-Dress rotating parts isolate vibration under full-throttle track loads.

Dynamic Stroker Dyno Output Curves

Operating across a potent 2,800 to 6,200 RPM power band, this mid-dress Windsor stroker generates 450 brake horsepower and 420 lb-ft torque on 93-octane premium pump gasoline. The retro-fit hydraulic roller camshaft specifies 230 degrees intake duration at 0.050-inch lift with 0.540-inch valve lift. Manifold vacuum measures 14 in-Hg at an 850 RPM idle setting. Hot engine oil pressure runs between 45 to 65 PSI, keeping rod journals and valvetrain gear coated with pressurized lubricant under continuous acceleration.

Engine Bay Subframe Fitment Clearances

This 347 stroker small block uses standard Ford six-bolt bellhousing bolt patterns, mating straight to C4, AOD, and Tremec manual transmissions. The external 28-ounce balance flexplate and flywheel accommodate automatic or manual transmissions. Motor mount bosses align with factory Mustang chassis frame perches. The front-sump oil pan clears steering linkages without cutting.

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 6 PSI, continuous RPM past 6,500, or raw marine sea water cooling.

• Drain break-in motor oil after the first 50 road miles.
• Renew synthetic or conventional motor oil every 3,000 miles.
• Inspect ignition timing, spark plugs, and distributor advance 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, aluminum cylinder heads, intake manifold, distributor, water pump, harmonic balancer, flexplate, flywheel, dyno test certification sheet, and startup guide. Components ship sealed in protective plastic wrap against oxidation.