This is a complete set of OEM Connecting Rod and Main Bearings, necessary to complete your engine build. 

All Rod Bearings are the the same type and shape. The part number will be 12111-31P0* where * indicates the grade number.

There are 3 types of Main Bearings; One Front, Two Middle and One Rear Bearing. The Front Main Bearing part number will be 12207-30P0* where * indicates the grade number. The Middle Two Main Bearing part numbers will be 12207-30P2* where * indicates the grade number. Notice this part number is different from the front by only one number, do not get these mixed up. The Rear Main (thrust) Bearing part number will be 12263-30P0* where * indicates the grade number. To make this more complicated, Nissan also used different suffixes to the part numbers over time. This means that in these part numbers 30P can be substituted with F65 and used interchangeably.

NOTE: The following bearing grades have been discontinued by Nissan:
Front Main Grade 0

Front Main Grade 1

Front Main Grade 2

Middle Main Grade 0

Middle Main Grade 4

Rear Main Grade 2

Rear Main Grade 3

ACL Bearings and KING Bearings are available.

Use the bearing grade calculator or select your own bearing grades from the options below.

How to find Grade Numbers to Input into the Calculator:

Rod Journal Grade Numbers from Crankshaft: Read from Left to Right with the counter weight in the upright position as shown in the image below.	Main Journal Grade Numbers from Crankshaft: Read from Left to Right with the letter 'F' indicating the Front of the Engine as shown in the image below.
Rod Journal Grade Numbers from Connecting Rods: For OE Rods, the Grade Number will be stamped on the cap as shown in the image below.  For Aftermarket Rods the Grade Number is assumed a '0'.	Main Journal Numbers from Engine Block: Read from Left to Right with the Front of the Block facing Left as shown in the image below.  Block Grade Numbers may be stamped upside down.