Yes they are clunkers, but I had those in my 340. Ran it to 7200 many times with stock rods. Never had an issue with them and mine were .060 over.
Clunkers you say ? ... spinning em UP to 7200
... gotta admit that they aren’t a Diamond piece ... but give those 2315s A BREAK !
A story about the L2315Fs .. years ago .... anyone remember Buckeye Sales ? ... my GRANDFATHER told me this story
He was buying from BUGeye at jobber price and WD on others. The sales guy calls HIM up and gives him a SUPER DEAL on several lines but especially TRW .....
HE bought A TON of pistons ! and most of those were the 2315s ....
If HIS memory serves ... something like 7 beans EACH !
Did you sell them all or leave them in a building in Meeeeeeeecheeegan?? 
