Roush SF427SRCPC 427 CI Street Race Performance Crate Engine

Description

During continuous summer track day laps, the Roush SF427SRCPC Street Race Performance Crate Engine maintains unyielding horsepower output. This 427-cubic-inch Windsor-based package generates 550 horsepower at 6,100 RPM and 535 lb-ft torque. It powers high-end restomods, street-legal road course cars, and competition track vehicles requiring continuous cooling and balanced high-RPM rotating internals.

Built upon a heavy-duty cast iron block featuring four-bolt splayed ductile main caps, this engine endures brutal internal forces. The rotating kit comprises a 4340 forged steel crankshaft turning a 4.000-inch stroke, 4340 steel H-beam connecting rods, and 4.125-inch bore forged aluminum pistons producing 10.4:1 compression. A seven-quart performance oil pan regulates lubrication, holding dry weight at 517 lbs.

Key Features of Roush SF427SRCPC

Track-oriented vehicle builders find immediate throttle response and structural durability inside this turnkey crate package. Enthusiasts who buy Roush SF427SRCPC crate engine packages attain precision machine work verified by comprehensive dynamometer testing.

• 4.125-inch bore forged pistons eliminate thermal skirt deformation during long heat cycles
• 4340 forged steel crankshaft counterweights reduce torsional stress on main bearings
• CNC ported aluminum cylinder heads maximize mixture charge speed into combustion chambers
• 2.08-inch stainless intake valves allow unrestricted air flow during peak piston demand
• Custom performance camshaft profiles expand mid-range torque on corner-exit acceleration
• SF427SRCPC valvetrain linkages maintain lash settings across thousands of track shifts
• Full roller rocker arms cut frictional parasitic drag inside cylinder head covers
• Seven-quart oil pans prevent oil aeration during intense braking and directional changes

Dynamometer Output Valvetrain Metrics

Dyno tests register 550 brake horsepower at 6,100 RPM and 535 lb-ft torque at 4,400 RPM across a broad 2,500 to 6,400 RPM operating band. Camshaft geometry provides 0.576-inch intake lift, 0.585-inch exhaust lift, and 238/244 duration at 0.050-inch lift. Fueled by 93-octane unleaded pump fuel, the package generates 14 in-Hg intake manifold vacuum with 45 to 65 PSI oil pressure.

Drivetrain Mounting Envelope Clearances

This engine block incorporates the classic Ford 6-bolt bellhousing configuration for direct mounting to Toploader, TKO, or TKX transmissions. Internal neutral balancing permits balanced aftermarket clutches. Standard small-block Windsor motor pad positions seat down onto factory crossmembers without header interference or firewall clearance issues in vintage engine bays.

Lubrication Break-In Excluded Uses

Pre-charge internal oil passages with high-zinc break-in oil using a priming tool prior to initial cranking. Evacuate all air pockets from the cooling system to prevent premature hot spots around the combustion chambers. This performance engine is not engineered for marine water cooling, continuous industrial duty, or forced induction boost surpassing 8 PSI.

• Change break-in fluid and inspect magnetic drain plugs after the first 50 miles
• Replace engine oil and change high-flow oil filters every 3,000 miles
• Inspect drive belts and re-torque intake manifold bolts every 12 months

Factory Warranty Physical Manifest

Roush guarantees this crate engine through a 24-Month / 24,000-Mile limited parts warranty. The sturdy transport crate contains the complete long block, high-rise intake manifold, electronic distributor, high-flow water pump, balancer, and certified dyno performance test printout.