Roush DL427RDSPC 427 CI 550 HP Race Performance Crate Engine

Description

Harness massive road course acceleration through the Roush DL427RDSPC Race Performance Crate Engine in your track machine. Generating 550 brake horsepower at 6,100 RPM, this 427-cubic-inch small block Ford platform pairs dual-sump oil control with polished aluminum components, creating an engine package ready for competitive road racing and car shows.

Solid cast iron construction establishes the foundation, outfitted with four-bolt ductile iron main caps holding a 4.000-inch stroke 4340 forged steel crankshaft. Forged 6.200-inch H-beam rods swing forged 4032 aluminum pistons across 4.125-inch bores. This architecture holds a 10.4:1 compression ratio, backed by a polished seven-quart dual-sump road-race oil pan, scaling in at 508 lbs dry weight.

Key Features of Roush DL427RDSPC

Motorsport teams buy Roush DL427RDSPC crate engine units to attain track durability with elite visual craftsmanship. Billet brackets and polished valve covers resist engine bay corrosion under intense heat cycles.

• Dual-sump baffled road-race oil pan halts fluid starvation during heavy braking
• 4.125-inch iron cylinder walls retain roundness under high combustion pressures
• 4.000-inch forged 4340 crankshaft withstands hard transbrake drag launches
• Forged 4340 steel H-beam connecting rods resist severe dynamic rod stretch
• 10.4:1 forged pistons permit operation on 93-octane premium pump gasoline
• Polished aluminum dual-plane intake manifold optimizes middle-range port velocity
• Polished valve covers protect dual valve springs and roller rockers from road debris
• DL427RDSPC rotating balance components cancel secondary vibration harmonics

Track Calibrated Dynamic Dyno Metrics

Power peaks at 550 brake horsepower at 6,100 RPM with 535 lb-ft maximum torque arriving at 4,400 RPM across a wide 2,500 to 6,500 RPM operating spread. The roller camshaft features 238 degrees intake and 246 degrees exhaust duration at 0.050-inch lift, alongside 0.580-inch lift. Premium 93-octane fuel maintains stable burn cycles, pulling 12 in-Hg manifold vacuum with 50 to 70 PSI oil pressure.

Transmission Mating Frame Rail Spacing

The standard Ford small block six-bolt bellhousing pattern bolts straight to Tremec TKX, TKO, and Ford C6 automatic transmission cases. An internal neutral balance configuration utilizes zero-ounce flywheels and dampers. Low profile dual-sump oil pan rails clear tubular road race front crossmembers and steering rack linkages.

Initial Break-In Operating Restrictions

Before primary starter engagement, flood all internal galleries using a mechanical pre-lube tool pressurized with high-zinc break-in petroleum fluid. This competition unit is not intended for marine raw seawater cooling, 87-octane fuel, or turbocharger boost exceeding 9 PSI on standard gap rings.

• Dump the initial break-in petroleum fluid following the first 50 miles of run time
• Swap engine oil every 3,000 miles using specialized high-zinc performance formulas
• Inspect pushrod straightness and rocker bolt torque every 12 months

Factory Warranty Coverage Complete Manifest

The DL427RDSPC includes a 24-Month or 24,000-Mile manufacturer limited warranty for non-sanctioned street competition use. Physical contents include the dressed race long block, polished dual-sump oil pan, polished intake manifold, high-performance distributor, ignition wires, and an authentic dyno sheet.