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Browse Parts By Category Air Cleaners Air Scoops Alternators American Turbine-AT 309 Jet Drive American Turbine-SD 309 Jet Drive American Turbine-SD 312 Jet Drive Ball Cocks Battery Boxes Battery Switch Bearings Bell Housings Berkeley Jet Drive Bilge Pumps Block-off Plates Borg Warner Transmissions Bosses Bosses, Cavatation Plates Cables and Accessories Cams Carburetor Wedges Carburetors and Accessories Cavitation Plates Accessories Clamps Cleats Closed Cooling Collars, Safety Controls Coolers Couplers, Split Sleeve Dampers Deck Mounts Dip Sticks and Tubes Distributors Dividers Dominator Jet Drive Drains Drive Lines Dry Run Kits Engine Mounts Engine Oil Supplement - E.O.S. Engines G.M. Long Block Engine Assemblies Engines Marine Epoxy Putty Exhaust Elbos Exhaust Ports Exhaust Ports with Mufflers Exhaust Systems Fasteners Fins Flame Arrestors Flex Plates Flush Kits Flywheel Power Take-Offs (Specify Std or P.G.) Flywheels Foot Throttles Fuel Fills Fuel Filters Fuel Lines Fuel Pumps Gaskets Gate Valves Gauge Bezels Gauge Mount Gauge Senders Gauges Grab Handles Grease, Jet Harmonic Balancers Heat Exchangers Hose Hose Fittings Instruments Intake Manifolds Jet Garden Hose Connection Kits Kodiak Jet Drive Lenco Trim Tabs Motor Mounts Mufflers Oil Adapters & Hose Kits Oil Coolers Oil Drain Kits Oil Filters Oil Pans Oil Primers Packing Paint Pick-Ups Place Diverter Jet Trim Plugs Plugs Polish Propeller Shafts Propellers Pulleys Pumps Rudder Support Bracket Rudder/Stuffing Boxes Rudders Run Dry Kits Sand Trap Sea Strainer Seals Senders Sensors Shaft Log Shaft Log Stuffing Boxes Shafts Ski - Tows Spark Plugs Speed Grates Speedcoat Starters Steering Accessories Steering Systems Steering Wheels Stringer Washers Struts Switch Bezels Switches Tach. Mount Tachometer Thermostat Kits Throttles Thru-Hull Fittings Tiller Arms Tilt Shims Timing Gear Covers Timing Pointers Trim Tabs Turnbuckles Universal Joints V - Drives Valve Covers Valve Covers Accessories Velvet Drive Borg Warner Transmissions Vents, Fuel Water Cover Plates Water Filters Water Pumps Wedges Wire Extension Wire Harness, Engine Click to enlarge Category Engines Sub-Category G.M. Long Block Engine Assemblies Part number 2903505686 Description 4 Bolt 300 HP 350 1955-1986, requires L.H. Short or R.H. Long dip stick, Two Piece Rear Seal The HP 290/350 is GM Performance Parts' value leading crate engine, with 290 horsepower @ 5100 RPM, and 326 lb-ft of torque @ 3750 RPM on 87 octane fuel. The HP 290 horsepower will provide great long term durability with its 4-bolt mains, PM steel rods, strong cast aluminum pistons. The camshaft has .450" intake and .460" exhaust lift with hydraulic flat tappets. The cast iron cylinder heads have 1.94" intake and 1.50" exhaust valves with 76 cc combustion chamber. The heads have the conventional 12 bolt intake manifold attaching design used from 1955 through late 1980. This engine was designed to work with the following components: intake manifold 10185063, HEI distributor 3440806, balancer 6272221, flex plate 471529,you will also need a small block starter, water pump and fuel pump. Technical Notes: GM Crate Engines are horsepower rated to SAE Standards. Contact us for pricing and additional details: By Telephone at +1-604-278-1880 By Email at sales@californiamarine.com Copyright California Marine Sales Corporation, 1999-2024. California Marine Sales Corporation, #150-6751 Graybar Road, Richmond, B.C., Canada V6W 1H3 Phone (604) 278-1880, Fax (604) 278-6040 Email: sales@californiamarine.com ** We Ship WorldWide **