GM SB Compatible 383 c.i. Engine - 432 HP - Short Block Plus
GM SB Compatible 383 c.i. Engine - 432 HP - Short Block Plus
GM SB Compatible 383 c.i. Engine - 432 HP - Short Block Plus

GM SB Compatible 383 c.i. Engine - 432 HP - Short Block Plus

SKU: BP38321SP

GM SB Compatible 383 c.i. Engine - 432 HP - Short Block Plus

SKU: BP38321SP

HP & Torque: 432 HP / 450 FT. LBS

Compression Ratio: 9.5:1 with 64cc Head and .041" Thick Gasket - 18 cc Dish Volume

Camshaft: Hydraulic Roller Cam - .495 Intake / .502 Exhaust Lift and 220 Intake / 224 Exhaust Duration @ .050 - 114° LSA

Pistons: Forged

Crankshaft: Forged Steel Crank - 3.750" Stroke and 5.700" Rods

Regular price $5,349.00
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Part #: BP38321SP


  • HP & Torque: 432 HP / 450 FT LBS
    Compression Ratio: 9.5:1
    Forged Pistons
    Forged Crank


  • 4 Bolt main
  • 1 piece rear main seal.
  • 4.00" bore
  • Passenger side dipstick 
  • 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 forged crankshaft, 3.75" stroke
      Forged pistons, 18CC Dish
      Forged rods with 150,000 PSI bolts
      Hastings moly rings 
      Melling high volume oil pump 
      Hydraulic roller cam 
      Heavy duty double roller timing set
      Harmonic balancer

    Cam Specs w 1.5 Rocker Ratio:

    • Cam Type: Hyd Roller
      .495 Intake .502 Exhaust
      220 Intake / 224 Exhaust duration
      @ .050 - 114 degree lobe separation

    Ignition Timing:

    • 34 degrees total (at 3500 RPM)

    Also Includes:

    • Oil pan and timing cover 


    • Bore and stroke combination makes this crate engine a 377ci displacement

      This engine requires a non-weighted 8" harmonic balancer (included), and late 350ci weighted flexplate/flywheel.

      The HP and Torque numbers were derived from dyno testing with a 750cfm carb, and with H8002K cylinder heads installed.

      *A bronze distributor gear is NOT recommended on this engine

      Not for use in pollution-controlled vehicles.


    The satisfaction of our customers is our highest priority at BluePrint Engines. We use quality components to balance your engine's rotating assembly within two grams of spec. We dyno test your crate engine and certify that it's ready to deliver horsepower and torque.

    We give your BluePrint engine the industry's best-in-class warranty for 30-months / 50,000 miles — with the extra confidence only BluePrint can provide. Our warranty applies to individual or professional installations and is fully transferable.

    For a detailed overview of our warranty, click here.


    We make sure we hit our target horsepower and proper torque with every crate engine. We use an advanced computerized balancer to get our rotating assemblies within two grams, ensuring silky smooth power over the entire RPM range. That's precisely why our engines sound and run better than our competitors.


    A comprehensive, dyno-generated printout showing these critical specs will accompany your delivered engine. No more guessing or wondering what your installed engine's real-world peak horsepower and torque ratings actually are. Any doubters in the crowd? Simply flash 'em your dyno results!

    This engine will be dyno tested before it ships to you at no additional charge (others charge $500)!

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