GM 383 Base Engine for Throttle Body Trucks/ SUV's 1986 - 1995 • Cast Iron Heads • Flat Tappet Cam
BP38302CT - GM 383 Base TBI Truck Engine World Heads
HP & Torque: TBI - 315 HP / 415 FT LBS
Compression Ratio: 9.5:1
Cast Iron Heads
Hypereutectic Pistons
Flat Tappet Cam
Cast Steel Crank
Part #: BP38302CT


4 bolt main block bored .040 over
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
GM heavy beam rods with 150,000 psi bolts
Hastings Moly rings
Rotating assembly balanced to within 2 grams
Melling high volume oil pump
Flat tappet hydraulic lifter camshaft
Double roller timing chain

Cylinder Heads:

New cast iron 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
HP long slot rockers 
3 angle valve job

Cam Specs:

Cam Type: Flat Tappet
.435 Intake .454 Exhaust
209 Intake / 216 Exhaust duration
@ .050 - 112 degree lobe separation

Ignition Timing:

Set at manufacturer specifications

Also Includes:

TBI dual plane
Custom programmed ECM specific for your application
Timing cover
Oil pan
Valve covers
Brass freeze plugs
Dyno tested – and shipped with results


30 month / 50,000 mile


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

When ordering this engine BluePrint Engines will also need you PROM and Service numbers from your vehicle.

This engine was designed to run with all stock engine components such as throttle body, fuel pump etc.


Not for use in pollution controlled vehicles.

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