ACL Race main bearings for Chevrolet LS and LQ-series V8 engines with standard crankshaft. ACL Race Series is developed for high-load engines and is often used for tuning, motorsport and performance rebuilds where higher demands are placed on the bearings than in standard use.
ACL Race Series main bearings are manufactured with high-strength materials and optimised bearing design to ensure high load capacity, improved heat transfer and stable oil supply under load. The bearings have extended oil grooves, which help improve oil distribution to the connecting rod bearings and help maintain a stable oil film at high loads and engine speeds.
Improvements in material, dynamic thickness, heat transfer, oil grooves and oil distribution are some of the factors that make ACL one of the leading manufacturers of performance engine bearings. Correct bearing fitment and oil clearance are essential for oil pressure, reliability and engine life.
Specifications:
Type: ACL Race main bearings
Material: Trimetal copper/lead alloy (F780) with steel backing and electroplated overlay
Crankshaft: Standard size (STD)
Oil clearance: 0.006–0.046 millimetres
Bearing design: 180° oil groove in the upper bearing half with matching partial oil groove in the lower half
Bearing type: Upper and lower main bearings
Contents: 10 bearing halves (5 complete main bearings)
ACL part number: 5M7298H-STD
Maximum overall length: 26.1 millimetres
Maximum shaft size: 65.007 millimetres
Maximum tunnel size: 69.887 millimetres
Maximum vertical oil clearance: 0.046 millimetres
Maximum wall at crown: 2.43 millimetres
Minimum shaft size: 64.993 millimetres
Minimum tunnel size: 69.873 millimetres
Minimum vertical oil clearance: 0.006 millimetres
Fits engine code:
LR4 / LY2 / LS1 / LS6 / LS2 / LS3 / L99 / LFA / L76 / L98 / Vortec 6.0L / Vortec 6.2L
