Serval

What do all the numbers meen on the top of my piston ive been told the513 meens stock stroke but what about the rest?

Thanks for the confidence no bore needed

Both even

Currently 122 with a scratched cylinder

Currently 122 with a scratched cylinder

Elevation 800 above

I have 64.75 bore so .030 over im just wondering what my compression should be at no port work and unsure of stroke i have not measured that stock heads