ACL Race Series Rod Bearings Small Block Chev Quad 4, 1.889"

• High performance Trimetal engine bearings
• Designed to withstand higher RPM conditions
• High strength overlay plate with reduced thickness for improved fatigue properties

8B1663H-STD, 8B1663H-001, 8B1663H-010 8B1663HX-STD

Specifications for STD size only

Sizes	STD, 001, 010
Oil Clearance
Half Type	Upper & lower
Material	F781
Min. Std Shaft Size	47,968 mm / 1.8885 in
Max. Std Shaft Size	47,981 mm / 1.8890 in
Min. Std Tunnel Size	51,181 mm / 2.0150 in
Max. Std Tunnel Size	51,194 mm / 2.0155 in
Max Wall at Crown	1,588 mm / 0.0625 in
Max Overall Length	20,12 mm / 0.7921 in
Notes
Diagrams	7000H-L 7000H-U

 

• 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.