howell just sent me my pistons bgut they dont look like 8.6:1 .. they look like my stock ones. is there any way to tell ? on the box it says the bore is 3.464, is that .20 over? if there is any way to tell please let me know.

Stock piston size is 3.443 - 3.444

so

If you add 3.444 to .020 you get 3.464


If the piston is dished on the top it is the lower compression piston.