ACL Race conrod 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 normal standard use.
ACL Race Series connecting rod bearings are manufactured from high-strength F781 tri-metal material and developed to handle high loads, high rpm and increased cylinder pressure. The bearings feature a hardened steel backing, optimised bearing design, improved heat transfer and precise tolerances, helping to maintain a stable oil film under demanding conditions.
The 8B663H series has standard width with enlarged chamfers, providing clearance for most aftermarket crankshafts with a larger radius at the crank journal. Correct oil clearance and precise installation are essential for optimal service life and reliability.
Specifications:
Type: ACL Race conrod bearings
Material: Tri-metal copper/lead alloy (F781) with steel backing and overlay
Crankshaft: Standard size (STD)
Connecting rod: For original or aftermarket connecting rods
Oil clearance: 0.023–0.077 millimetres
Bearing type: Upper and lower bearing halves
Contents: 16 bearing halves (8 complete connecting rod bearings)
ACL part number: 8B663H-STD
Maximum overall length: 21.25 millimetres
Maximum shaft size: 53.340 millimetres
Maximum housing bore size: 56.520 millimetres
Maximum vertical oil clearance: 0.077 millimetres
Maximum wall at crown: 1.572 millimetres
Minimum shaft size: 53.315 millimetres
Minimum housing bore size: 56.507 millimetres
Minimum vertical oil clearance: 0.023 millimetres
Fits engine code:
LR4 / LM4 / LM7 / LQ4 / LQ9 / L33 / LY2 / LY5 / LY6 / L76 / L92 / L98 / L99 / LFA / LC9 / LH6 / LMG / LS1 / LS2 / LS3 / LS6 / LS7 / LSA / LS9 / LSX
