I don't need anyone to measure pistons for me. The guy popped the head off a 261 he bought, curious as to what the cylinder walls looked like. He does not have the tools, equipment, or knowledge to rebuild an engine. When he saw the 90 on top of the pistons, he assumed it was .090 over. He emailed me photos because I told him .090 over seemed like a rather oddball oversize. I posted the pics to see if there was anyone familiar with the markings on top of the pistons, thats all.