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  • King XPG Series OD+.002" Oversize Outside Diameter Main Bearing | Subaru WRX/STI (MB5739XPG) - Modern Automotive Performance
  • King XPG Series OD+.002

    Save 11% with code "VET11"

    King Engine Bearings

    King XPG Series OD+.002" Oversize Outside Diameter Main Bearing | Subaru WRX/STI

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    Email - sales@maperformance.com
    Phone 1(888)627-3736



    $ 119.99   $ 160.00
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    Due to the nature of the Subaru split-block boxer engine design, where two halves of the engine are fastened together around the crankshaft, there can often be distortion or misalignment even on new engine blocks. This distortion can lead to uneven main bearing wear and occasionally bearing failure due to insufficient lubrication and overloading of the bearing surface material. Main line bore distortion can also occur in new blocks that have been assembled using high strength case fasteners, which are common in racing and high performance engine builds.

    When an EJ engine requires a repair to remedy a main line bore distortion issue, the labor involved can be tedious and therefore very expensive. The machinist would have to remove material from both sides of the split-block's mating surfaces and bore or hone back to a STD housing bore measurement so that a standard OD bearing can be utilized. This process also requires and extreme amount of precision and can cause a change in the crankshaft centerline to deck surface distance that would need to be compensated for.

    Housing Bore Spec's

    • 2.5217"-2.5225"
    • 64.051mm-64.071mm

    Crankshaft Undersizes

    • STD
    • STDX
    • .026
    • .25
    • .50

    Applications

    • 2004-2012 Subaru WRX
    • 2004-2012 Subaru STI

    What's in the box?

    • 1 Set of Main Bearings

    Warranty

    • King Limited Warranty
    • For More Info Contact Us

    Due to the nature of the Subaru split-block boxer engine design, where two halves of the engine are fastened together around the crankshaft, there can often be distortion or misalignment even on new engine blocks. This distortion can lead to uneven main bearing wear and occasionally bearing failure due to insufficient lubrication and overloading of the bearing surface material. Main line bore distortion can also occur in new blocks that have been assembled using high strength case fasteners, which are common in racing and high performance engine builds.

    When an EJ engine requires a repair to remedy a main line bore distortion issue, the labor involved can be tedious and therefore very expensive. The machinist would have to remove material from both sides of the split-block's mating surfaces and bore or hone back to a STD housing bore measurement so that a standard OD bearing can be utilized. This process also requires and extreme amount of precision and can cause a change in the crankshaft centerline to deck surface distance that would need to be compensated for.

    Housing Bore Spec's

    • 2.5217"-2.5225"
    • 64.051mm-64.071mm

    Crankshaft Undersizes

    • STD
    • STDX
    • .026
    • .25
    • .50

    Applications

    • 2004-2012 Subaru WRX
    • 2004-2012 Subaru STI

    What's in the box?

    • 1 Set of Main Bearings

    Warranty

    • King Limited Warranty
    • For More Info Contact Us

    Customer Reviews

    Based on 1 review
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    D
    D.S.
    Great Produxt

    Well made product. Too notch. MAPerformance has great customer service. Part was backordered due to manufacturer shortage but they kept me up to date and in the loop with the status the entire time.

    MAP Limited Lifetime Warranty

    1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

    2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

    3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

    4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

    For warranty evaluation please create a support ticket via this form here.

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