cams are kent (k2 is it?,cant remember without looking at the last rebuid receipt,not got it here) that make any difference?
1/ what would happen if they didn't have the cut outs and needed them?
bend the valves and maybe damage the pistons 
2/ can i get the pistons cut out?or do you buy them like that?
between £25-£40 per pistons to get them in OR buy already done
3/ and how will i know if they need the cut outs?
have to have the cam lopes measured for lift really
ta