If they are VE pistons, the come ready to work in a VE.
I believe the skirts aren't as long as stock pistons, so don't need notches.
A dude on our forum asked the same question.
Joe
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Fastest N/A SR20DE in UK 2009 & 2010.
SR20VE ITB + standalone, coming 2011.
they are notched. The skirts are also shorter than stock so even if they were not notched they should not be able to hit the squirters. I compared my cp vet pistons to my gtir pistons.