Main Bearing Bore

Bearing Cap Bore Diameter (Without Bearing)
A Stamping 49.000-49.006 mm (1.9292-1.9294 inches)
B Stamping 49.006-49.012 mm (1.9294-1.9296 inches)
C stamping 49.012-49.018 mm (1.9296-1.9298 inches)