Roush BD347RC 347 CI Race Carbureted Crate Engine

Description

Slash quarter mile drag elapsed times using the Roush BD347RC Race Carbureted Crate Engine. Displacing 5.7 liters across 347 cubic inches, this carbureted small block Ford outputs 450 horsepower at 6000 RPM and 420 lb-ft torque at 4500 RPM. Outfitted with an 800 CFM carburetor, high rise single plane intake, and Dart four bolt block, it delivers fierce straight line acceleration.

A premium cast iron Dart four bolt main block features reinforced main webs and extra deck thickness across 4.030 inch bores and a 3.400 inch stroke. Internal rotating hardware includes a 4340 forged steel crankshaft, forged 4340 H-beam connecting rods, and forged aluminum pistons yielding a 10.0:1 compression ratio. CNC ported aluminum cylinder heads set total dressed dry weight at 440 lbs.

Key Features of Roush BD347RC

Buy Roush BD347RC crate engine configurations to generate 450 horsepower small block Ford acceleration in vintage pro street vehicles. The dressed package pairs high flow aluminum cylinder heads with a tuned four barrel carburetor for immediate track readiness.

• 800 CFM four barrel mechanical secondary carburetor meters high air volume for unrestricted top end power.
• Single plane open plenum aluminum intake manifold supplies unrestricted air volume to cylinders above 3500 RPM.
• CNC ported aluminum cylinder heads drop front axle weight while maximizing air flow speed.
• Dart cast iron four bolt main block provides extreme bottom end rigidity under high RPM track loads.
• Forged 4340 steel crankshaft produces 420 lb-ft torque to launch lightweight roadsters hard off the line.
• Hydraulic roller camshaft profile creates sharp valve events without valve float past 6200 RPM.
• Roush BD347RC valvetrain components feature full roller rocker arms to eliminate stud deflection.

Carbureted 347 Race Dyno Output Profile

Testing on water brake engine dynamometers validates 450 brake horsepower at 6000 RPM and 420 lb-ft torque at 4500 RPM across an aggressive 2500 to 6400 RPM operating band. Cam duration measures 228 degrees intake and 236 degrees exhaust at 0.050 inch lift, producing 0.550 inch intake and 0.550 inch exhaust lift. The engine draws 13 in-Hg vacuum at 900 RPM on 93 octane fuel, maintaining 50 to 65 PSI hot oil pressure.

Small Block Ford Subframe Crossmember Mounting

Small block Ford exterior dimensions fit directly into classic Mustang, Falcon, and Cobra replica engine bays without chassis alterations. The internal neutral balance crankshaft couples to Ford Toploader, Tremec TKX, or C4 automatic transmissions using standard bellhousings. The single plane intake clears scoop openings, while the front sump oil pan clears forward suspension crossmembers.

Carbureted Small Block Startup Safeguards

Pre prime the engine oiling channels with high zinc break in oil using an oil pump drive tool prior to startup. This competition crate engine is not engineered for marine bilge setups, forced induction boost exceeding six PSI on stock ring end gaps, or unmetered nitrous oxide systems.

• Drain break in oil and replace the spin on lube filter after the first 500 operating miles.
• Perform regular motor oil changes every 3000 miles or six months with high zinc synthetic oil.
• Inspect carburetor float adjustments and verify ignition timing advance every 6000 street miles.

Roush 347RC Shipped Crate Manifest

Protection includes a 2-Year / 24,000-Mile factory limited warranty guarding against defective components. The shipment crate contains the assembled dressed engine, four barrel carburetor, single plane intake manifold, MSD distributor, front sump oil pan, valve covers, and an official dynamometer run sheet.