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So, after going back and looking at some of my notes, and comparing the LF3 and LFX piston, and looking at the ebay pistons, it LOOKS like those are probably a failed/abort mission stroker (or long rod motor) pistons based on the compression height.
They probably went with a smaller pin to put the compression height up much more than they could with the stock pin size. You can see pretty clearly the top of the pin is almost to the top of the oiling ring. Compare with LFX piston (Left) and LF3 piston(Right) below with the ebay pictures. LFX compression height measured appx 1.200", while the LF3 compression height measures 1.260" (The LF3 rods are .06" shorter than LFX rods, this gave them room to increase the upper compression ring thickness, and the oil ring thickness while also moving the ring lands down for a more "boost friendly" piston on the LF3)...
Mathwise, the ebay pistons were most likely built for someone that was planning on building a 3.9L stroker. I'd guess the person the pistons were originally spec'ed for lost steam when they found out how much the crank was going to cost to be made, plus the cost of custom rods, and now the pistons are on ebay. If the seller didn't spec them for a customer, they probably picked them up on some kind of Wiseco blow out because no one wanted them. They are pretty much useless to anyone that doesn't have deep pockets and is dead set on building a stroker. I REALLY hope someone does their research before buying them.
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