ACL Bearings 8B634HC-010 Race Series Rod Bearing Set 0.010" Undersize CT-1 Coated

The ACL Bearings 8B634HC-010 is a high-performance connecting rod bearing set designed for Small Block Ford 221, 255, 260, 289, and 302 Windsor engines. This complete set features 0.010 inch undersize bearings with advanced Calico CT-1 dry film lubricant coating, engineered specifically for racing and extreme performance applications.

CT-1 Coating Technology:

The proprietary CT-1 dry film lubricant coating provides superior protection against friction, heat, and wear. This advanced coating offers intermittent dry lubrication that is unaffected by dust or dirt, making it ideal for cold starts and conditions where oil starvation may occur. CT-1 coated bearings have demonstrated oil temperature reductions of 15-20°F and can increase load capacity from 12,000 psi to 180,000 psi compared to standard bearing overlays.

Key Features:

• High-strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backing for enhanced bearing retention and lining support
• Tri-metal construction combining copper-lead alloy with steel backing and electroplated babbitt overlay
• Increased eccentricity to compensate for bore distortion at high RPM operation
• Elimination of flash plating for improved heat transfer and housing grip
• Tight, consistent wall tolerances to maintain precise clearances
• Enlarged ID chamfers to accommodate large fillet radius on performance crankshafts
• CT-1 coating thickness: 0.00025" to 0.00030" (6 to 7.5 microns)

Performance Benefits:

• Reduced friction and parasitic drag for increased power output
• Superior embedability characteristics to protect crankshaft from debris contamination
• Enhanced corrosion protection and chemical resistance
• Lower coefficient of friction for improved efficiency
• Protection during cold starts and oil starvation conditions

ACL Race Series bearings are the proven choice of professional engine builders and championship-winning race teams across NASCAR, IHRA, NHRA, and sport compact racing. These bearings deliver the endurance and reliability required for high-performance engines that others cannot match.