ACL Race Main bearing set dedicated to N54B30/N55B30. They are the equivalent of serial bearings used by car manufacturers. Shells in standard size (STD).
Sizes
STD, .025, .25
Oil Clearance
Standard
Half Type
Identical Halves
Material
F780
Min. Std Shaft Size
64.961 (1397H) 55.961 (1398H) 55.961 (1399H)
Max. Std Shaft Size
64.980 (1397H) 55.980 (1398H) 55.980 (1399H)
Min. Std Tunnel Size
70.000 (1397H) 61.000 (1398H) 61.000 (1399H)
Max. Std Tunnel Size
70.019 (1397H) 61.019 (1398H) 61.019 (1399H)
Max Wall at Crown
2.508 (1397H) 2.508 (1398H) 2.508 (1399H)
Max Overall Length
19,85 mm / 0.7815 in (1397H) 18,85 mm / 0.7421 in (1398H) 24,01 mm / 0.9453 in (1399H(F))
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Manufacturer: ACL - Performance Engine Bearings 
