Hi there, i keep seeing these "Overbore" pistons....slated to be .025 overbore, does this translate to an 81.5mm bore on the sleeve? I am in need of help, would these raise the comp. levels to a reasonable level to run on pump gas?

 

standard oversize is 0.25 of a mm larger. thus 81.25mm

the itr pistons will yeild different compression ratios in different motors. but as long as the head isn't milled and the head gasket is stock i can't think of a motor that would have too high of compression for pump gas if you used the itr pistons.

having oversized also raises the compression a little bit...but when i say little, i mean little. nothing to be concerned about.