Roush DL427SRFSPC 427 CI Street Race Performance Crate Engine

Description

Satisfy competitive road racing class regulations with the Roush DL427SRFSPC Street Race Crate Engine in your track machine. Producing 515 horsepower at 5,800 RPM from 427 cubic inches, this small block Ford platform combines front-sump chassis fitment with mirror-polished aluminum components, making it ideal for vintage open-track racers and custom restomods.

Solid cast iron engineering creates the four-bolt main cylinder block foundation, housing 4.125-inch bores and a 4.000-inch stroke. A balanced 4340 forged steel crankshaft connects to 4340 forged H-beam rods and forged 4032 aluminum pistons. Featuring a 10.2:1 compression ratio and a front-sump polished road-race oil pan, the long block checks in at 506 lbs dry weight.

Key Features of Roush DL427SRFSPC

Classic restomod shops buy Roush DL427SRFSPC crate engine units to attain pushrod muscle with show car visual presentation. Polished billet brackets combine clean visual appeal with unyielding structural rigidity.

• Front-sump oil pan drops into classic Ford chassis without steering interference
• 4.125-inch iron cylinder bores support high cylinder pressures without distortion
• 4.000-inch forged stroke crankshaft endures violent clutch dumps and hard launches
• 6.200-inch forged H-beam rods feature high-strength rod bolt fasteners
• 10.2:1 forged pistons permit safe operation on 93-octane pump gasoline
• Polished aluminum dual-plane intake manifold increases middle-range throttle response
• Polished valve covers protect dual valve springs and roller rockers from debris
• DL427SRFSPC street-race balance eliminates high-frequency crank train harmonics

Combustion Curve Dyno Verification Parameters

Operating across an RPM band of 2,000 to 6,200 RPM, this pushrod engine produces 515 brake horsepower at 5,800 RPM and 530 lb-ft torque at 4,200 RPM. A hydraulic roller camshaft features 228 degrees intake and 236 degrees exhaust duration at 0.050-inch lift, alongside 0.550-inch valve lift. Utilizing 93-octane fuel, it pulls 15 in-Hg manifold vacuum while keeping 45 to 65 PSI oil pressure.

Transmission Flange Engine Envelope Clearances

The standard Ford small block six-bolt bellhousing pattern mates with Tremec manual boxes and Ford AOD or C4 automatics. Internal neutral balance requires zero-imbalance flywheels and harmonic balancers. The front-sump pan provides ample clearance over 1965-1970 Mustang steering drag links and chassis crossmembers.

Pre-Lube Setup Prohibited Use Cases

Pressurize the internal lubrication circuit using a mechanical oil primer shaft and high-zinc petroleum fluid prior to initial startup. This engine is not built for marine wet exhaust environments, forced induction exceeding 8 PSI boost, or pure methanol fuel mixtures.

• Drain break-in petroleum fluid after the first 50 miles of run time
• Replace engine oil every 3,000 miles using specialized high-zinc formulas
• Check valvetrain lash and rocker bolt torque every 12 months

Factory Warranty Coverage Complete Manifest

Roush provides a 24-Month or 24,000-Mile factory limited warranty covering defective internal parts. Included inside each crate is the dressed long block, front-sump oil pan, polished valve covers, billet distributor, plug wires, balanced damper, and a certified dyno output sheet.