I don’t believe it is indicative of the actual sizing. Nissan uses a grade system depending on the crank, piston and rods to match bearings. That is if you’re rebuilding using oem equipment.
Download the fsm and look up how to choose bearings under em.pdf.
Anyway...why the low compression? You may be able to use the base se-r piston and bring it down to a 9.6. Mind you no one has tried it. They also do not use the same block, at least the part numbers are different.
Wow, this is a little more than my old brain can handle. I am an old 1960s mechanic trying to rebuild a 2008 engine. I had no idea there were specific bearings I would have to use to rebuild. I thought I could get the crank turned and just buy the over size bearings. I do plan to use the same block, same rods, except for one, same head and maybe new pistons. The reason I want lower compression is so I can use regular gas instead of the high priced gas.
Will I have to have a matched set of rods or can I just buy another rod to replace the bad one? I would have never bought this car had I known it had an engine for hot rods instead of an everyday driver. My wife and I really like the little car we just don't need all the power. If I could find a JDM 2.0 or plain 2.5 that would fit, I would go that route. As far as I know, the SE-R Spec V 2.5 is the only engine that will fit this car.
One more: Where can I buy new bolts for the balance shaft, I had to grind the old ones off as at that time I couldn't find a socket that would fit the bolts, I have one now. Oh and where can I buy the flywheel bolts, I messed one of them up. I have way too many questions and the only reason I ask them here is I can't find them on the internet. I do have the factory manual downloaded, it just doesn't give bolt sizes that I have found.
One more question and I will shut up. Can I pull the 6 speed transmission with the engine in the car? I have a few more questions but I have over stayed my welcome already. I really really do appreciate the help.