I bought an assembled b18c1 short block back in 2006. Now I am finally getting around to putting parts on it but have no idea what pistons it has and the seller Lauboi wont get back to me.
My guess is p30(jdm b16a) or PCT(jdm b16b) pistons since the previous owner said they were CTR pistons.
If I need to put a ruler on them I can, but I am trying not to pull them as I will need a ring compressor.
Here are pictures of the top.
Mystery Piston image 1
Mystery Piston image 2
Mystery Piston image 3

One set will be 11.53:1 and the other is over 13:1. So the piston dome actually matters depending on which one it is.

 

Look like pct's to me.

 

I just got in touch with the seller, and your right on. PCT's for the win.
Now I get to order a head gasket at double thickness so I am not 13.08:1

 

Pct