whats the numbers? most aftermarket cams and regrinds have the duration number stamped on them. though the only "stage" of cams i know of is brian crower cams. no other company i recall called them stages. just durations, like 256, 264, 272, 280, etc.. i believe the hks 5m cams i have are 280 duration, however being they are race cams and wernt sold commercially i wont know untill i can have them spec'd. no part number or duration anywhere on them. they wer machined from hks blanks so only marking on them is hks