King Racing Main Bearings for L3-VE MZR Duratec EcoBoost


King Racing’s XP series of rod and main bearings pushes the boundaries of racing technology with an array of advanced features. These bearings are engineered to meet the rigorous demands of racing, enhancing both durability and performance. The unique pMax Black structure, developed to cater to the increasing demand for higher engine-bearing load capacity, integrates cutting-edge metal composition and hardening technology. This results in a bearing capable of carrying 24% more load, improving engine performance and longevity.

In addition, innovative design elements like the U-Groove, ElliptiX, EccentriX, and RadiaLock bring further enhancements. U-Groove increases bearing load capacity by expanding the effective surface area while maintaining oil flow. ElliptiX combines oil slot and oil hole elements to improve oil ingress without compromising load capacity. EccentriX optimizes eccentricity values, ensuring each bearing meets specific performance requirements. RadiaLock customizes crush height for each application, accounting for factors like engine block material and torque, ultimately perfecting the bearing’s fit and performance.

Suitable for

  • 2.0 EcoBoost
  • 2.3 EcoBoost
  • 2.3 L3-VDT MZR DISI Turbo Duratec
  • 2.5 L5-VE MZR Duratec


  • STDX -0.025 mm (looser than nominal)
  • STD +0.000 mm (nominal)
  • +0.25 mm (first shaft cut)
  • +0.50 mm (second shaft cut)


  • pMax Black Structure: Incorporates a unique metal composition to enhance engine-bearing load capacity by 24%.
  • U-Groove Design: A 90⁰ groove shape increases load capacity without compromising oil flow.
  • ElliptiX Technology: Combines oil slot and hole for improved oil ingress without affecting load capacity.
  • EccentriX Precision: Optimized eccentricity values meet performance requirements.
  • RadiaLock Customization: Crush height tailored to each bearing’s specific application.

Additional information

Shipping Weight 0.464 kg
Shipping Dimensions 29 × 11 × 6 cm

King Racing


0.025, 0.75, 0.25, 0.50, STD, STDX


Mk3 (05-15)

Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.

Make Model Year
Mazda MX-5 III (NC) 2005 - 2015

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