BluePrint Engines GM 383 Crate Engine Short Block Plus 432 HP

This short block engine (BP38321SP) is dyno-tested to ensure you get 432 HP and 450 ft-lbs. of torque! It uses a 4" bore and a 1.6" rocker arm. Plus, the cylinder heads are sonic-tested to ensure they reach the correct thickness.

Features and Benefits:
- High-strength cast iron crate engine block w/ passenger side dipstick
- 432 Horsepower / 450 Ft. Lbs. Torque
- Compression Ratio: 9.5:1
- Features 4-bolt main, 4.000" bore, and 1-piece rear main seal
- Align-honed main bearing bore
- Forged crankshaft, forged pistons (18cc dish) with 3.750" rotation stroke
- Forged crankshaft connecting rods w/ 150,000 PSI bolts
- Hydraulic roller cam design w/ 1.5 rocker ratio
- Ignition Timing: 10-16° and Total timing 32-34° at 3500 RPM
- Fuel Delivery Type: Carbureted 750CFM
- Backed by BluePrint Engines' 30-month/50,000-mile warranty

Cylinder Head Features:
- Honed on computer-controlled machine to within 0.0002 straightness/roundness
- Sonic-tested for thickness control

Camshaft Specifications:
- 0.495" Intake / 0.502" Exhaust Lift
- 220 Intake / 224 Exhaust Duration
- @ 0.050-114° Lobe Separation

Also Includes:
- Oil Pan
- Timing Cover
- Harmonic Balancer

Additional Notes:
- This engine features a true 4" bore, which mathematically yields 377 CID with a 3.75" stroke.
- 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.
- NOT for use in pollution-controlled vehicles.
- A bronze distributor gear is NOT recommended on this engine.