do you mean :find wear in??

if so dependant on engine type 2/or4/ and or na or forced induction

2/ na: normally wear on ring lands and contact faces
2/ forced: i have found to wear a lot heavier on contact faces
4/ na: as 2/ na
4/ forced: a lot lot heavier on contact faces as the piston lands seem to be softer and seem to take the brunt of the wear, they seam to wear excessivly on the top of the contact face, but i would presume that this has a lot to do with the high combustion pressures we are putting them under

Hope this answers your question