Product Summary

350, 383, Long Block Crate Engine Type

  • 4 bolt main 1pc rear seal block
  • Cylinder heads have hardened retainers and springs
  • Features a new cast steel crankshaft and hypereutectic pistons
  • This GM 383 base engine produces 405 horsepower and 440 ft./lbs. Of torque
  • The cylinders are honed on a computer controlled machine to within .0002 straightness and roundness

Need To Know

Ineligible for Return

Contains items that cannot be returned


True Blue Power! BluePrints pro engine builders are enthusiasts just like you and it shows in the quality and performance of every engine they build. Each BluePrint crate engine is carefully dyno tested and ships with printed, proven results. If you’re looking serious horsepower at an affordable price, BluePrint Engines is the choice for you!

GM 383 Base Engine - Cast Iron Vortec Heads - Flat Tappet Cam


  • HP & Torque: 405 HP / 440 FT LBS
  • Compression Ratio: 9.5:1
  • Cast Iron Heads
  • Flat Tappet Cam
  • Cast Steel Crank
  • Part #: BP3830CT1


  • 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
  • Flat tappet hydraulic lifter camshaft
  • Heavy duty double 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
  • 1.5 long slot, stamped steel rockers
  • Hardened push rods

Cam Specs

  • Cam Type: Flat Tappet
  • .487 Intake .503 Exhaust
  • 234 Intake / 244 Exhaust duration
  • @ .050 - 112 degree lobe separation

Ignition Timing

  • 34 Degrees Total at 3500 RPM

Also Includes

  • Aluminum intake manifold
  • New chrome valve covers
  • Brass freeze plugs
  • Dyno test results shipped with engine



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.