318 Pistons: baffled

New thread, just to clean up the topic.

Engine: 1968 318. thought to be original, turns out, its a replacement 318 with no vin stamping on the pad. From 1968 Dodge.

Now that I've cleaned up the parts abit; quick caliper measurement....not micrometer.
Crank MB journals measures: 2.495 crank bearings, good, no oversize markings.
ConRod measures: 2.123 Spec. 2.125. no oversize marks on bearings. bearings down to copper.

PISTONS: 2 "look" different....slightly different machining finish, lighter in color. no number on piston tops. Other 6 marked: 2899446 OS Thats the one on the right....

Quick check on the bore looks to be 3.930 (.020 over) gotta measure......

here are picts of the pistons removed.

Also shown is the 285 NP purchased piston, in std. size. (now that I know I'm over.....its gotta go back anyway. :( what the hell! no valve reliefs! may be a truck piston in the wrong box! more research needed.

Anyone have a clue what could have happened? Previous owners no help.....

Still trying to decide what to do........