Roush SF347IRC 347 CI SF Individual Runner Crate Engine

Description

During continuous summer track day laps, the Roush SF347IRC Individual Runner Crate Engine runs cool while delivering 450 horsepower at 6,000 RPM. Displacing 347 cubic inches from a 302-based small block Ford foundation, this unit features electronic eight-stack individual runner fuel injection to optimize throttle modulation through road course corners.

A precision-cast iron block features four-bolt main bearing caps carrying a 4340 forged steel 3.400-inch stroke crankshaft. Forged 4340 H-beam steel connecting rods couple to forged 4032 aluminum pistons inside 4.030-inch bores. This architecture holds a 10.0:1 compression ratio, lubricated by a seven-quart baffled oil pan, while total long block weight checks in at 445 lbs.

Key Features of Roush SF347IRC

Restomod builders buy Roush SF347IRC crate engine units to equip vintage street machines with authentic eight-stack induction visuals and digital fuel precision. Independent throttle runners maximize low-end throttle response while maintaining top-end breathing efficiency.

• Eight-stack individual runner throttle bodies provide instantaneous induction throttle response
• 4.030-inch precision honed cylinder bores support ring seal under sustained high load
• 3.400-inch forged steel crankshaft spins with internally balanced counterweights
• 5.400-inch forged H-beam rods resist severe wrist pin deflection under acceleration
• 10.0:1 dish forged pistons clear high-lift stainless intake valves
• 2.02-inch stainless intake valves maximize intake port flow velocities
• CNC ported aluminum cylinder heads maximize mixture flow toward large intake valves
• SF347IRC electronic engine controller maps fuel delivery without stumble or lag

Dynamic Induction Power Delivery Parameters

Operating between 2,200 and 6,200 RPM, this powertrain cranks out 450 brake horsepower at 6,000 RPM and 420 lb-ft torque at 4,200 RPM. A hydraulic roller camshaft profile operates with 224 degrees intake and 232 degrees exhaust duration at 0.050-inch lift, paired with 0.544-inch valve lift. The calibrated electronic control unit runs on 93-octane premium unleaded fuel, pulling 14 in-Hg manifold idle vacuum and sustaining 45 to 65 PSI hot operating oil pressure.

Bellhousing Interface Frame Rail Spacing

A standard Ford small block six-bolt bellhousing pattern mates with manual top loaders, Tremec TKX manuals, and AOD automatics. The internal neutral balance rotating group runs a 157-tooth steel flywheel. Dual side engine mount bosses align with Fox-body and classic Mustang frame pads, preserving header clearance past factory shock towers.

Engine Pre-Lube Maintenance Directives

Pre-lube the internal oil passages using an external priming shaft tool before initial ignition to distribute high-zinc break-in petroleum fluid across all internal roller lifters. Never route this competition street power unit into marine raw salt water cooling passages, continuous turbo boost exceeding 9 PSI on stock ring gaps, or alcohol drag fuels.

• Drain break-in fluid after the initial 50 miles of run time
• Swap motor oil every 3,000 miles using high-zinc synthetic formulas
• Check valvetrain lash settings every 12 months of operational street driving

Limited Warranty Crating Manifest Documentation

A comprehensive 24-Month or 24,000-Mile factory warranty backs this long block package against material defects. Crate packaging contains the dressed engine, eight-stack throttle body system, distributor, spark plug wires, aluminum water pump, front balancer, and an engine dyno sheet.