ATK HP100C Ford 347 Stroker 450HP Stage 3 Long Block Crate Engine

Description

Need aggressive Ford stroker horsepower? Select the ATK HP100C Ford Crate Engine 347 Stroker Stage 3 package. Engineered for high-performance Mustangs, Shelby cobras, and restomod street machines, this 5.7-liter Windsor stroker V8 produces 450 brake horsepower at 6,000 RPM. Complete with aluminum cylinder heads, four-barrel carburetor, dual-plane intake, and electronic distributor, this turnkey long block produces tire-shredding small-block acceleration.

Engine builders start with a seasoned Ford cast iron block, clearance-notching the cylinder skirts for stroker 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 430 lbs.

Key Features of ATK HP100C

Motorsport enthusiasts buy ATK HP100C crate engine packages to drop high-revving stroker horsepower into pro-touring builds without sourcing individual accessories. The turnkey long block drops flush into classic Ford engine bays using standard motor mounts.

• 3.400-inch stroker crankshaft expands displacement to 347 cubic inches for rapid acceleration.
• High-flow aluminum cylinder heads maximize volumetric efficiency while reducing vehicle nose weight.
• Retro-fit hydraulic roller camshaft profile generates aggressive valve lift without excessive seat wear.
• Performance four-barrel carburetor meters fuel uniform across wide-open throttle transitions.
• Dual-plane aluminum intake manifold optimizes high-velocity mixture charge to combustion chambers.
• Billet distributor and plug wires generate strong spark energy across the 6,000 RPM range.
• External 28-ounce harmonic balancer counters high-RPM torsional crank harmonics.
• Balanced ATK HP100C rotating components isolate harmful vibration during hard acceleration pulls.

Dynamic Stroker Dyno Output Curves

Operating across an aggressive 2,800 to 6,200 RPM power band, this high-performance 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 high-rate valvetrain hardware lubricated under aggressive track 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 aligns with performance torque converters. Motor mount locations align with factory Mustang chassis frame perches. The front-sump oil pan clears steering linkages and front crossmembers 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 carburetor float levels 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 turnkey long block, aluminum cylinder heads, intake manifold, carburetor, distributor, spark plugs, wires, water pump, harmonic balancer, flexplate, dyno test certification sheet, and startup guide. Components ship sealed against oxidation.