I have a set of 8 TRW pistons for a 426 wedge. They are used with about 3,000 miles on them. The part number is 2185F and they are 030 over. These were in one of my motors back in the early seventies. One of the rods spun a bearing and I had the connecting rod removed so I could replace it. I ended up getting a great deal on a 440 Six Pack motor and put the pistons aside. They are in my storage and I'll look for them in the next few days. I do not remember what the compression ratio of these are.