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Inboard & I/O Engine Parts

Inboard Marine Engine Parts and Accessories

As the largest online dealer of inboard boat parts, Marine Parts Source will help you find the right engine parts you need for any project. We’re here to assist with seasonal maintenance, major repairs and more so you can get back on the water. Use our convenient categories to browse our collection — or if you know the part number you need, enter it into the search bar. From oil and fuel filters to spark plugs, exhaust manifolds, bell housings, starters and alternator belts, we supply boat owners from coast to coast.

You can always count on quality and knowledge when you shop with us. We’re an authorized dealer of the leading OEM and aftermarket performance inboard marine brands, including J&N Electric, Sierra, Arco Marine, Volvo Penta and Crusader. If you have a question, our sales associates have the technical expertise to answer it. Enjoy free ground shipping on qualifying orders so your vessel is ready for adventure.

Inboard & I/O Engine Parts

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  1. Thermostat Kit | Indmar 491010
    Thermostat Kit | Indmar 491010
    IND-491010
    Qty In Stock: 6
    Brand: Indmar
    Thermostat Kit Learn More
    MSRP: $60.25 $47.23
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  2. Indmar 756002 Spark Plug Wire Set
    Delco EST Spark Plug Wire Set | Indmar 756002
    IND-756002
    Qty In Stock: 26
    Brand: Indmar
    OEM Indmar spark plug wire set for V8 GM 350 & 383 cu. in. small block marine engines with Delco EST ignition system. Learn More
    MSRP: $110.36 $87.96
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  3. Pierburg Electric Fuel Pump | Indmar 556184
    Pierburg Electric Fuel Pump | Indmar 556184
    IND-556184
    Qty In Stock: 37
    Brand: Indmar
    OEM fuel pump used on many Indmar EFI marine engines found in Malibu & Supra boats from 2003-2009. Learn More
    MSRP: $329.80 $262.83
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  4. Small Image
    ETX Port Aluminum Exhaust Manifold | Indmar 531301E
    IND-531301E
    Qty In Stock: 10
    Brand: Indmar

    OEM Indmar one piece exhaust manifold used on Vortec 5.7 liter Monsoon & 6.2 liter Hammerhead marine engines

    Learn More
    MSRP: $1,896.84 $1,511.70
    Add to Wishlist
  5. PLATE DRIVE GM IND-885203_SM
    GM Damper Plate | Indmar 885203
    IND-885203
    Qty In Stock: 14
    Brand: Indmar
    OEM Indmar damper plate fits GM 5.7L, 6.0L, 6.2L & 8.1L marine engines with 14 in. flywheels. Learn More
    MSRP: $321.42 $288.45
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  6. Small Image
    ETX Starboard Aluminum Exhaust Manifold | Indmar 531300E
    IND-531300E
    Qty In Stock: 5
    Brand: Indmar

    OEM Indmar one piece exhaust manifold used on Vortec 5.7 liter Monsoon & 6.2 liter Hammerhead marine engines

    Learn More
    MSRP: $1,896.84 $1,511.70
    Add to Wishlist
  7. Indmar 531400HL EXTCAT Starboard Aluminum Catalyst Exhaust Manifold
    EXTCAT Starboard Aluminum Catalyst Exhaust Manifold | Indmar 531400HL
    IND-531400HL
    Qty In Stock: 7
    Brand: Indmar

    OEM Indmar one piece exhaust manifold with catalyst exhaust element for Vortec 5.7 liter Monsoon & 6.2 liter Hammerhead marine engines.

    Learn More
    MSRP: $1,924.80 $1,603.70
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  8. Indmar 872023-1 OEM Marine Engine Oil Filter - GM 5.7L, 6.0L & 6.2L
    OEM Marine Engine Oil Filter for GM 5.7, 6.0 & 6.2 liter Engines | Indmar 872023-1
    IND-872023-1
    Qty In Stock: 61
    Brand: Indmar

    Recommended for all 5.7 liter & GM based 6.0 liter & 6.2 liter below S/N 174786. Indmar filters capture 45 percent more dirt and last 30 percent longer than a leading national automotive brand.

    Learn More
    MSRP: $16.50 $14.00
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  9. Indmar 531401HL EXTCAT Port Aluminum Catalyst Exhaust Manifold
    EXTCAT Port Aluminum Catalyst Exhaust Manifold | Indmar 531401HL
    IND-531401HL
    Qty In Stock: 0
    Brand: Indmar
    OEM Indmar one piece exhaust manifold with catalyst exhaust element for Vortec 5.7L Monsoon & 6.2L Hammerhead marine engines. Learn More
    MSRP: $1,924.80 $1,603.70
    Add to Wishlist
  10. EXTCAT Exhaust Manifold Gasket | Indmar 556202SPEC
    EXTCAT Exhaust Manifold Gasket | Indmar 556202SPEC
    IND-556202SPEC
    Qty In Stock: 16
    Brand: Indmar

    Special exhaust manifold mounting gaskets for Indmar engines with EXTCAT manifolds.

    Learn More
    MSRP: $35.36 $35.02
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  11. Indmar 495117 Electric Fuel Pump Conversion Kit
    Electric Fuel Pump Conversion Kit | Indmar 495117
    IND-495117
    Qty In Stock: 6
    Brand: Indmar
    OEM Indmar pump kit includes everything needed to convert obsolete 55-6014 fuel pump to new style fuel pump. Learn More
    MSRP: $511.24 $416.09
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  12. Small Image
    Serpentine Drive Belt | Indmar 725034
    IND-725034
    Qty In Stock: 8
    Brand: Indmar

    Indmar OEM serpentine belt used on a variety of 5.7L marine engine modelsfrom 2003 & up.

    Learn More
    MSRP: $50.56 $40.29
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