6B2639H-.25

The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Trimetal engine bearings.

Designed to withstand higher RPM conditions, ACL Race Series Engine Bearings are available for many of the popular 4, 6 & 8 cylinder applications and feature:

• High strength overlay plate with reduced thickness for improved fatigue properties
• Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.
• Increased crush for improved bearing retention
• Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximize the grip between the bearings and its housing.
• Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.
• 3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.
• Tight consistent wall tolerances to help you maintain consistent clearances.
• Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.

Tunnel [mm]	57 / 57.013
Shaft [mm]	53.962 / 53.974
Max. Wall	1.508
Max. Length	17
Half Type	Identical halves

Compatibility
Nissan	350Z, Skyline, Infiniti EX35, FX35, M35	DOHC 24v	VQ35HR	6	6B2639H	3498 cc	DOHC v24	-.25	95.5	81.4
Nissan	370Z, Skyline, Fuga, Infiniti EX37, FX37, M37	DOHC 24v	VQ37VHR	6	6B2639H	3696 cc	DOHC v24	-.25	95.5	86.0
Nissan	Z, Infiniti Q50, Q60	DOHC 24v Twin Turbo	VR30DDTT	6	6B2639H	2997 cc	DOHC v24	-.25	86.0	86.0