GM 383 Dressed Engine • Cast Iron Vortec Heads • Roller Cam
HP & Torque: 420 HP / 450 FT LBS
Compression Ratio: 9.5:1
Cast Iron Heads
Roller Cam
Cast Steel Crank
Part #: BP3833CTC1


4 bolt main 1pc rear seal block w/Passenger side dipstick only
Square and parallel decked
Align honed main bearing bore
Cylinders honed on computer controlled machine to within .0002 straightness and roundness
Cylinders are sonic tested for thickness

Rotating Assembly:

New cast steel crankshaft
Hypereutetic pistons
Chevy heavy beam rods with 150,000 psi bolts
Hastings Moly rings
Balanced rotating assembly
Melling high volume oil pump
Roller camshaft
Roller tip rockers
Heavy duty roller timing set

Cylinder Heads:

Cast iron Vortec heads
1.25 diameter valve springs
Hardened retainers and springs
2.02 swirl polished intake valves
1.60 swirl polished exhaust valves
Hardened push rods

Cam Specs:

Cam Type: Roller
.510 Intake .520 Exhaust
230 Intake / 236 Exhaust duration
@ .050 - 110 degree lobe separation

Ignition Timing:

34 degrees total (at 3500 RPM)

Also Includes:

Aluminum Intake Manifold
750 cfm Carburetor
HEI Distributor
Harmonic Balancer
Fuel Pump
Water Pump
BluePrint Plug Wires
Spark Plugs
Chrome Steel Valve Covers
Brass Freeze Plugs
Dyno test results shipped with engine



30 month / 50,000 mile


This engine requires a 400ci weighted harmonic balancer, and late 350ci weighted flexplate/flywheel.

BluePrint Engines recommends a 2000- 2400 rpm stall converter.

Not for use in pollution controlled vehicles.

Shop for related parts:

BPP143 — Air Cleaner

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