383 SB-Chevy Short Block+ Assembly 3.75" Stroke Forged Steel Crankshaft

Name: 383 SB-Chevy Short Block+ Assembly 3.75" Stroke Forged Steel Crankshaft
Brand: BLUEPRINT ENGINES
SKU: 138-BP38321SP
Price: 5999.00 USD
Availability: OutOfStock

Currently Unavailable

This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

Chevy Small Block

3.75'' Stroke Forged Steel Crankshaft
4-Bolt Main Cap Block
Forged Pistons
9.5:1 Compression Ratio w/64cc Heads
Hydraulic Roller Camshaft .528''/ .536''
1-Piece Rear Main Seal
Int / Ext Balance

Note: Horsepower numbers were achieved with Blueprint p/n 138-H8002K Cylinder Heads installed on this short block assembly.
Horsepower: 432
Torque: 450
Engine Block:
New Blueprint Engine Block
4.00' Bore
Nodular Iron Splayed 4-Bolt Main Caps
1-Piece Rear Main Seal
Rotating Assembly:
3.75' Stroke Forged Steel Crankshaft
Forged Pistons (18cc Dish) - 9.5:1 Compression Ratio when using 64cc Combustion Chamber Cylinder Heads
Internal Front, External Rear Engine Balance
8' Non-Weighted Harmonic Balancer Included
Late 350 Weighted Flexplate/Flywheel Recommended (Not Included)
Camshaft Specs:
Hydraulic Roller
Duration @ .050' Lift: 221° Intake / 226° Exhaust
Lift: .528' Intake / .536' Exhaust
Lobe Separation: 110°
Other Features:
Factory type roller lifters
Hastings moly rings
Melling high volume oil pump
Heavy Duty Double Roller Timing Set
Chrome Timing Cover
Oil Pan
Passenger side dipstick
Brass Freeze Plugs
7.200' push rod length recommended with hydraulic roller style cam and lifters, but always check for the exact push rod length with your particular combination of components.
Dyno tested - shipped with results

Notes: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.

A bronze distributor gear is NOT recommended on this engine.
Engine Break-In Procedure
Use or break-in oil or conventional (non-synthetic) multi-viscosity oil with zinc additive for the first 500 miles of operation. Avoid hard acceleration for sustained periods. Periodically change the engine speed while driving to help seat the rings. While the engine is running, be sure to check oil pressure and coolant temperature, and check for fluid leaks, such as oil, transmission fluid, fuel, and coolant/antifreeze. Also listen for any unusual sounds. Should you hear an unusual sound, shut the engine off, check for the source, and correct it.
Engines with flat tappet cams only - Start the engine and bring it to 2,000 RPM. Get the engine running smoothly. Then vary the engine speed from 1,800-2,200 RPM in a slow acceleration/deceleration cycle for 30 minutes. This is necessary to provide adequate oil splash and lifter rotation to properly mate each lifter to its lobe.
At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil. After 6,000 miles, synthetic oils can be used in your engine. For flat tappet cam engines, continued use of oil with zinc or a zinc additive for the life of your engine is recommended.