ACL Race Series Main Bearings are engineered to handle the demanding conditions of high-performance and high-RPM engine builds. Designed specifically for Nissan’s KA24E and KA24DE engines, these trimetal main bearings provide excellent oil film control, increased fatigue resistance, and superior bearing retention under extreme stress. Ideal for street or track use, these bearings help extend engine life and maintain consistent clearances in performance applications.

Key Features

• Trimetal race-grade construction for maximum durability

• Standard (STD) size with additional undersizes (.025, .25) available

• High-strength overlay plate with reduced thickness for improved fatigue resistance

• Hardened steel backing for better support and housing fit

• 3/4 groove design improves oil flow and bearing load distribution

• Enhanced eccentricity to account for high-RPM bore distortion

• No flash plating to optimize heat dissipation

• Precision-machined for consistent oil clearance

• Enlarged chamfers to accommodate large crankshaft fillets

• Includes both upper and lower bearing halves

Technical Details

• Bearing Type: Main Bearings

• Size: Standard (STD)

• Tunnel Diameter: 63.659 – 63.672 mm

• Shaft Diameter: 59.962 – 59.975 mm

• Max Wall Thickness: 1.834 mm

• Max Length: 19.00 mm

• Half Type: Upper and Lower

• Weight: 0.33 kg

Fitment Information
Designed for Nissan 4-cylinder engines using the KA24 family:

• KA24E – SOHC 2.4L

• KA24DE – DOHC 2.4L

Fits a wide range of Nissan models equipped with these engines, including older trucks (D21), 240SX, Altima, Stanza, and others. Always confirm engine code and journal dimensions before ordering.

What’s Included

• (1) Set of ACL Race Series main bearings (upper and lower halves)