ACL Race Series Main Bearing Set: Holden 186
Part Number: 7M2384H-STD
Application: Holden Red Series (138, 149, 161, 179, 186)
Product Overview
The ACL Race Series Main Bearing Set (7M2384H-STD) is engineered specifically for the Holden "Red" engine family. These bearings are designed to meet the extreme demands of motorsport, offering superior load-carrying capacity and longevity compared to standard aftermarket components.
Understanding the Part Number
7M: Indicates Main Bearing set.
2384: The base engineering designation for the Holden 6-cylinder series.
H-STD: Indicates standard oil clearance and standard crankshaft journal diameter.
Fitment Summary
Compatible with all Holden Inline-6 (OHV) Red Motors, including: 138ci, 149ci, 161ci, 179ci, and 186ci engines.
Technical Specifications
Max Tunnel Size: 60.721 – 60.747 mm (2.3906 – 2.3916 in)
Max Shaft Size: 55.824 – 55.849 mm (2.1978 – 2.1988 in)
Wall at Crown (Max): 2.423 mm (0.0954 in)
Why Choose the Race Series?
Unlike standard replacements, the ACL Race Series utilizes a robust Tri-Metal composition designed to handle high-RPM heat and mechanical stress without distortion. Key enhancements include increased crush for better retention, increased eccentricity for oil film stability, and large fillet radii compatibility.
Disclaimer: Always verify clearances using a bore gauge and micrometer during assembly.
