FOR SALE 1989 MerCruiser 5.7L 350 V8 260 HP Marine Engine NO SALT Drop In Ready 473 HOURS. This engine runs strong and has always been fully.

The 1989 MerCruiser 260 HP is a rugged, 350-cubic-inch (5.7L) marinized small-block Chevrolet V8. It features a 4-barrel carburetor, producing 260 horsepower at 4,800 RPM. Known for reliability, this engine runs a standard 9.3:1 compression ratio and generates massive low-end torque.

General Specifications

• Engine Type : V8, 4-stroke gasoline
• Displacement : 350 cid(5.7 L)
• Horsepower : 240 HP at 4,800 RPM
• Bore & Stroke : 4.00″ X 3.48″
• Compression Ratio : 9.3:1
• Firing Order : 1-8-4-3-6-5-7-2
• Maximum RPM Range : 4,400 to 4,800
• Fuel Requirement : Regular unleaded (minimum 87 octane)

Mechanics & Fluids

• Idle Speed : ~600 RPM (in gear)
• Oil Capacity : 5 Quarts (with filter)
• Recommended Oil : SAE 30 or 20W-50
• Spark Plug Type : AC Delco CR43TS
• Cooling System : Raw water cooled (thermostat opens at 160)