340 High Dome Pistons

340 demon 72 said
Standard bore on a 340 is 4.03 these measures 4.04 so .01 over , the piston measures 4.04 so I'm sure the bore needs to be 4.044 to 4.045

Just for the sake of absolute accuracy, a STANDARD 340 bore is 4.040 not 4.030.

So, I'm still not sure what you have, and can't make an offer until it is clear what the numbers are.

When you get an accurate measurement, let me know. I'd be interested if the bore size is what I need.