ACL Bearings 4B1630HX-STD Race Series Connecting Rod Bearings Standard Size

ACL Race Series connecting rod bearings are engineered for tuning and high-performance engine builds where superior quality and higher bearing capacity than OEM bearings are essential. The 4B1630HX-STD features standard size dimensions with a shaft size range of 44.961-44.974mm and tunnel size of 48.000-48.013mm, utilizing F781 tri-metal bearing material.

Key Performance Features:

• High strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backs on all rod bearings to improve support and assist with bearing retention
• Elimination of flash plating on bearing backs to improve heat transfer and maximize grip in the housing
• Increased eccentricity to compensate for bore distortion at high RPM and assist hydrodynamic oil film formation
• Innovative design improves bearing retention from higher radial contact pressure and locks the bearing into the housing

This bearing set features identical halves with an overall length of 18.6mm and provides vertical oil clearance ranging from 0.042mm to 0.084mm. The HX-STD designation indicates extra clearance for high-performance applications, and can be mixed with H-STD bearings of adjacent grades to fine-tune oil clearances. ACL Race Series bearings are proven components in championship-winning race engines from drift racing to NASCAR, IHRA and NHRA competitions.