It isn't stroke due to the oddballs being on the same journal, and you can't swap pistons due to valve notch arrangements, but switching rods might tell you a story.
Thanks for the heads up on those two points. I don't build engines (obviously) so I didn't think of that.
I'll just have to compare the rods.
You know, just looking at the numbers, it looks as though the block decks do slope downward towards the .008 piston and upwards toward the 0.016 piston. It's just the sudden difference at the last pistons...so maybe a slight slope in the deck compounded by some slightly different rods makes for such a big difference...error stacking.
