I don't know if its the way I am measuring, if I got the wrong rings sent to me or what!
To start:
F54 block / P90 head, standard dished pistons. The engine ran fine, no blow by or excessive oil consumption, just lower compression than I wanted.
I am upgrading to Nissan Motorsports cast pistons, in stock bore. I had the block hot tanked and honed.
I measure the bores at 3.386 inches, 86.01mm which is in spec according to the clymer manual, but when I slide a ring into the cylinder to check the end gap, it comes out to about 4mm instead of the .2 to .4mm it should be.
I don't know what to do at this point. I thought the machine shop took too much material off when honing, so first I bought a set of used oversized pistons from Dannys Datsuns and was going to bring the block back to get it bored, but they wound up being L24 oversized pistons when they arrived, so that was a waste of $150.
I thought maybe I got rings for an L24 instead of an L28, but the rings I have are larger than the L24 rings that came on the above pistons.
I just got another block from a friend, but its actually been overbored already, as its got 87mm bores.