i don’t leave reviews often, but i’d hate to see more people have the same problem me and plently of others have experienced. these pistons have a flaw, they tend to snap the piston ringland up top by the intake valve relief. i got a solid 2 hours of runtime then the piston gave out, ended up taking out my cylinder head, cylinder, and the piston itself of course. i’ve spoken to a few other people who have had this same issue, i’d really like to see a re-design on these. ring gaps were in spec following the specs dhm provides.