Blueprint Engines Marine Gm 383 C.I.D. 405 Hp Base Stroker Long Block Engines With Cast Components Mbp3830Ct

The Blueprint Engines Marine 383 C.I.D. 405 HP Base Long Block (MBP3830CT) combines Blueprint’s proven stroker architecture with marine-specific durability.
Each engine is professionally assembled, balanced, and dyno-tested to provide consistent performance and dependable operation in demanding marine environments.

This base long block configuration includes the short block, cylinder heads, and valve train components, allowing you to add your preferred marine intake, ignition, and accessories.
With a 383 cubic inch displacement and high-torque cam profile, it’s designed to deliver strong mid-range power ideal for high-performance boats, cruisers, and watercraft upgrades.

Performance Overview:

• Factory dyno-tested at approximately 405 HP and 440 lb-ft torque

• 383 cubic inch (6.3L) displacement based on small block Chevy architecture

• Balanced, blueprinted, and marine-rated construction

• Cast crankshaft, rods, and pistons for durability and cost efficiency

• Designed for marine cooling and fuel delivery setups

• Built and tested in the USA

Key Features

• Marine small block Chevrolet 383 stroker configuration

• Precision-balanced rotating assembly

• Cast crankshaft, rods, and pistons

• Cast iron block and cylinder heads

• Hydraulic flat tappet camshaft

• Blueprinted and assembled by Blueprint Engines

• “Base” long block – ready for installation of marine intake and ignition

• High-torque marine cam profile for strong mid-range pull

• Factory dyno-tested before shipment

Technical Specifications