ATK High Performance Engines DM20 Chevy 350 5.7L Marine Crate Engine

The ATK High Performance Engines DM20 is a complete 350 cubic inch (5.7L) marine crate engine designed for boat applications using Chevrolet small block powerplants manufactured until 1985. This replacement engine delivers 260 horsepower and features a durable cast iron block and cylinder heads built to withstand the demanding marine environment.

Key Specifications:

• Displacement: 5.7L/350 cubic inches
• Power Output: 260 horsepower
• Bore x Stroke: 4.00 inches x 3.48 inches
• Compression Ratio: 9.0:1
• Construction: Cast iron block and cylinder heads
• Balancing: Externally balanced configuration
• Rotation: Standard (clockwise) rotation
• Rear Seal: 2-piece rear main seal design
• Dipstick Location: Right-hand side

This marine engine is engineered specifically for boat applications with appropriate marine-grade components and sealing to handle the unique challenges of the water environment. The externally balanced design and standard rotation configuration make it compatible with most marine transmission and drive setups used in classic Chevrolet-powered boats. Compatible with pre-1986 Chevrolet 350 marine installations featuring 2-piece rear seal design.