Datsun Roadster Forum-311s.org

"knurled to take up slop - to much clearance
It's not a ideal solution but works , kind of a in car overhaul trick"

"looks like that piston may have been dropped or something ... looks like a large burr on the bottom of the skirt."

"looks like a crack between the oil control and second compression ring. The entire cast piston looks rough."

All of the above. Not something I would re-use.

Looks like it may have actually been used already ... you can also see vertical striations along the side of the piston

Yes, this looks to be a used set of pistons. Are they OEM standard or anything special? Do they look like any ones that have been removed from a stock engine?

Thanks for the help folks