ACL Race Bearings - Mains (Honda D16 / D17 / H22A4 / F23A) | Niced Up

Upgrade your engine foundation with the ACL Race Series Main Bearings Set (Part # 5M1957H-STD) engineered specifically for Honda D16, D17, H22A4 (55mm), and F23A engines. ACL Race Series performance bearings are manufactured to exacting tolerances with meticulous attention paid to wall thickness accuracy, ensuring a reliable fit and maintaining consistent oil clearances under high-load racing and forced-induction conditions.

Featuring a high-strength trimetal copper-lead construction with hardened steel backing and no flash plating, these bearings deliver superior fatigue resistance and thermal conductivity required for high-RPM and turbo applications.

Key Features & Benefits:

• Trimetal Construction: High load capacity copper-lead structure with galvanic overlay for exceptional wear and seizure resistance.
• Precision Tolerances: Strict wall thickness control maintains precise oil clearances for optimal journal lubrication.
• Enhanced Heat Dissipation: Eliminated flash plating improves thermal transfer directly into the main housing bores.

Vehicle Fitment & Compatibility:

• Acura: 1986–1989 Integra (D16A1)
• Honda Accord: 1998–2002 Accord (2.3L F23A1 / F23A4 / F23A5)
• Honda Civic: 1988–2000 Civic (D16A6 / D16Z6 / D16Y7 / D16Y8), 2001–2005 Civic (D17A1 / D17A2)
• Honda Prelude: 1997–2001 Prelude SH & Base (2.2L H22A4 with 55mm main journal)

Technical Specifications:

• Bearing Type: Main Engine Bearings (Standard Size - STD)
• Journal Diameter: 55mm Main Journal
• Material: Tri-Metal Alloy (Copper-Lead / Steel Backed)
• Warranty: ACL Performance Limited Manufacturer Warranty
• Brand: ACL Performance