Certified Custom Clearance ACL Rod Bearing Set - S85 V10 - BMW M5-M6 E60/63

On the S65 and S85, the accepted fix for rod-bearing wear is a mixed set of ACL shells (HX and H) to land the right oil clearance. The catch is that "mixed" only works if the shells actually measure where they're supposed to. This set removes the guesswork: every shell is measured and certified before it goes in the box.

Instead of in-house measurements or handheld tools, every bearing shell is measured and certified by Michigan's most reputable metrology lab on $150,000 measuring equipment, verified against ACL's published specifications. Each set is verified to provide an additional clearance of +0.0125 mm. Shells that don't meet spec are rejected — only certified, lab-measured shells make it into a set. See the full process in our build video.

ACL Race Series has been the trusted choice in championship and record-setting builds across drift, NASCAR, IHRA, and NHRA.

Construction and why it matters:

• Tri-Metal lead/copper: a hardened steel backing layered with copper and topped with a soft lead overlay. The lead is embeddable: small particles bed into it instead of scoring the crankshaft.
• High-strength overlay plate, reduced thickness, for improved fatigue resistance under load.
• Hardened steel backs support the bearing and hold retention in the housing.
• Increased crush for better retention under high stress.
• No flash plating on the backs: improves heat transfer and grip between bearing and housing.
• Optimized eccentricity compensates for bore distortion at high rpm and helps form the hydrodynamic oil film.
• Precision wall tolerances hold consistent clearances for consistent oil flow.

What makes this the Certified Custom set: standard extra-clearance sets ship as-supplied; this set is a custom mixed-shell build (HX + H) with every shell lab-measured and certified to +0.0125 mm, and out-of-spec shells rejected.

Fits: E6X M5/M6 (S85), M5/M6 E60/E63