Roush SF427RPC 427 CI Race Performance Crate Engine

Description

Featuring a 427-cubic-inch displacement block, the Roush SF427RPC Race Performance Crate Engine delivers 560 brake horsepower at 6,250 RPM. This Windsor-based competition unit combines forged rotating components with CNC port matching for road courses and drag strips. It produces fierce acceleration across the entire power curve, motivating stripped track cars and vintage race chassis alike.

A premium cast iron performance block serves as the structural foundation, anchored by four-bolt splayed ductile iron main caps. Inside, a 4340 forged steel 4.000-inch stroke crankshaft joins forged steel H-beam rods and 4.125-inch forged aluminum pistons to establish a 10.4:1 compression ratio. A front-sump baffled racing oil pan stabilizes lubrication, keeping dry engine weight at 518 lbs.

Key Features of Roush SF427RPC

Drivers gain competition-grade engineering inside a classic small-block form factor suited for sports car road racing. Builders who buy Roush SF427RPC crate engine assemblies acquire dyno-proven powerplants engineered for high-RPM endurance and structural rigidity under track conditions.

• 4.125-inch bore forged pistons feature coated skirts to suppress piston rock and wear
• 4340 forged steel crankshaft handles repeated high-RPM launches without journal distortion
• 2.08-inch intake valves maximize flow efficiency at valve lift thresholds past 0.500-inch
• 1.60-inch exhaust valves dump high-temperature combustion gases straight into collector tubes
• Hydraulic roller valvetrain tracks aggressive cam lobe profiles without premature float
• SF427RPC ignition systems yield hot spark distribution across high-heat combustion cycles
• 7-quart baffled oil sumps preserve constant oil pressure through tight track chicanes
• Dual-plane aluminum intake manifolds generate exceptional charge distribution across all runners

Brake Output Ignition Metrics

Dyno testing validates 560 brake horsepower at 6,250 RPM with 540 lb-ft torque at 4,600 RPM throughout a functional 3,000 to 6,600 RPM band. Camshaft geometry measures 0.576-inch intake lift, 0.590-inch exhaust lift, and 240/246 duration at 0.050-inch lift. Tuned for 93-octane unleaded pump fuel, this configuration pulls 14 in-Hg intake manifold vacuum at idle and sustains 45 to 60 PSI oil pressure when hot.

Bellhousing Drivetrain Rail Clearances

A standard Ford 6-bolt bellhousing bolt circle pairs straight to four-speed, five-speed, and modern six-speed manual transmissions. The internal neutral-balanced crank allows simple flywheel balancing, while factory mounting bosses align with classic Mustang and Cobra replica frame brackets. Compact valve cover height avoids interference with firewall brake boosters and shock towers.

Lubrication Guidelines Service Exclusions

Prime the engine lubrication circuit with high-zinc break-in petroleum fluid before rotating the starter pinion. Purge coolant air through the thermostat bypass to prevent localized steam pocket generation across cylinder heads. This track-bred engine is not engineered for marine marine cooling circuits, alcohol fuel conversion, or heavy continuous vehicle towing.

• Dump initial break-in petroleum lubricant after the first 50 miles
• Swap synthetic oil and replace spin-on filter canisters every 3,000 miles
• Measure valvetrain pushrod end-play clearance every 12 months

Crate Inventory Warranty Terms

Protected by a 24-Month / 24,000-Mile limited manufacturer warranty against internal casting or component defects. The delivered container contains the fully assembled engine, high-flow water pump, distributor, ignition wires, dyno sheets, harmonic balancer, and technical setup guide.