Both slave and master are both stock replacements. I know the master is 5/8, the slave seems to be the same diameter but it is not stamped. And neither are leaking.
I tried some more things out but none lead to an answer. I put in a much longer pushrod for the slave(was VERY DIFFICULT to make fit and bolt up) and trans finally went into forward gears with a little bit of extra push on shifter, reverse grinded everytime and HARD to go in. Did not like that at all, didn't feel right. I was sure that the TO bearing would be pressing against fingers and then get burnt out fast.
I pulled the trans out again and inspected further, I recompared the clutch old/new. I noticed that the new pressure plate fingers were just a hair over 1/4 inch further OUT from clutch disc than they were on the old. Just overlooked it the first time.
My car was swapped with an L26 by previous owner, it's mated to a 4 speed. Is there a difference in clutches between 240z and 260z? The new clutch I got was for a 260z.
It is a LuK clutch kit part #06-029.