BluePrint GM engines give you brute, honest horsepower that'll leave others in your rear view mirror. Produced from hand-picked, seasoned four-bolt main blocks and precision built to exacting specifications.
Power: 420 HP @ 5700 RPM, 450 ft. lbs. of torque @ 4400 RPM
Displacement: 383 CID
Bore x Stroke: 4.040” x 3.75”
Compression Ratio: 9.5:1
Recommended Fuel: 91 Octane
Block: Cast Iron, 1 piece rear seal, 4-bolt main caps with passenger side oil dip stick hole, brass freeze plugs.
Crankshaft: Cast Steel, polished, stress relieved and shot peened with chamfered oil oils
Connecting Rods: Heavy Beam with 150,000 psi bolts
Pistons: Hypereutectic Aluminum
Camshaft: Steel Hydraulic Roller Tappet
Cam Lift: .520” Intake / .540” Exhaust
Cam Duration @ .050”: 236 deg. Intake / 242 deg. Exhaust
Lobe Separation: 112 Degree
Cylinder Heads: Cast Iron Vortec.
Combustion Chamber: 64cc
Valves: 2.02” Intake/ 1.60” Exhaust
Rocker Arms: Stamped Steel, 1.5:1 Ratio
Valve Springs: 1.25” Diameter
Balance: External Front, External Rear
Ignition Timing: Base 10 degrees BTDC, 32 degrees total
Recommended Torque Converter Stall 2000-2400
• Fully assembled long block
• Stamped Steel Chrome Valve Covers
• Performance Dual Plane Aluminum Intake
• Melling High Volume Oil pump, pick-up and oil pan
• Front timing cover with 8” timing pointer
• Oil Filter Adapter
• Dyno Test Sheet
BluePrint limited 30 month / 50,000 mile parts & labor warranty. Click Here to view or download warranty form.