Aussie Steve said:Cxman, educate the ignorant. What do you mean by knurl the pistons? Thanks
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I'm not going to attempt to explain it myself, but here's a good article to explain it. Most of the time, guys do it to extend the life out of their piston/bore. I always though it was more of an old school thing, but I think guys still do it today. My old man did it to one of our VW drag cars when I was a teen, which got us maybe a dozen more race weekends out of the motor before we tore it down.
https://www.enginebuildermag.com/2017/09/lost-art-knurling-pistons-takes-skill-guts/