I'm building a beater b20 motor using ycp brand pistons. Typically on the stock replacements with the moly coat it's of the grayish hue, but when I opened these they were green coated. I'm just checking to see if anyone knows what the difference between them is.

 

never saw that.. maybe they have a new coating.

 

like these from this company?
http://www.ebay.com/itm/YCP-B16-B18-B20-85mm-Oversize-High-Compression-Pistons-Rings-kit-Honda-Acura-/191018438789?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c79961085&vxp=mtr

 

Yes. But the skirts are green. When I host this image I'll post. I've assembled the engine already and the fell within spec of what oe calls for. If they fail I'll know not to use them again

 

I didnt look up your specific pistons, but I found out some pistons use a green teflon ptfe coating. Sounds like thats what yours have. The black/grey ones are sometimes graphite but I think they also have black/grey teflon coats on others