ACL 5M8174HX-STD Race Main Bearing Set (Extra Clearance) for Ford/Mazda 2.0 L

Vehicle Fitment

• Ford / Mazda 4-cyl Duratec / MZR: 2.0L, 2.3L (standard-size crank)

Features

• Race-series tri-metal construction for high load endurance
• Extra oil clearance ("HX" spec) for high-stress or modified engines
• Full-groove upper shells for improved oil flow
• Precision-machined to tight tolerances for reliable clearances
• No flash plating on the back, improving thermal transfer and retention
• Increased eccentricity to compensate for bore distortion at high RPM
• Enlarged fillet chamfers to suit performance crankshafts
• Optimized for racing or tuned applications

Specifications

• Part Number: 5M8174HX-STD
• Bearing Size: Standard (OEM journal size)
• Oil Clearance: Extra (HX)
• Shaft Diameter (max): ~52.0 mm / 2.0472 in
• Tunnel Diameter (max): ~57.04 mm / 2.2456 in
• Maximum Wall Thickness at Crown: ~2.49 mm
• Bearing Width: ~19.1 mm / 0.752 in
• Half-type: Identical upper / lowers (standard halves)
• Construction: Tri-metal (steel backing, copper-lead intermediate, lead/tin overlay)

Included Components

• 5x main bearing shells (full set for one engine)

Product Description

The ACL 5M8174HX-STD is a high-performance Race Series main bearing set engineered for Ford and Mazda 2.0L and 2.3L four-cylinder engines. Its tri-metal construction offers exceptional durability and resistance to fatigue under racing or high-powered conditions.

The "HX" variant provides extra oil clearance, ideal for engines with modified tolerances or operating under higher loads. Full-groove upper shells promote efficient oil delivery, while increased eccentricity helps maintain oil film stability at elevated RPM.

Designed for performance builds, this bearing set balances reliability and longevity for tuned street motors or race engines, ensuring high-stress endurance and precise fitment.