Generation IV External Engine - ls1/ls2/ls3 cam laying on a table. identify????

if all three cams are laying on a table how can i tell the difference? is there any numbers or markings,

if all three cams are laying on a table how can i tell the difference? is there any numbers or markings,

http://www.chevythunder.com/LS1%20components.htm#Camshaft Identification

There is a 4 digit code on the back of the cams, match that up to the last four digits of the GM part number.

If theyre aftermarket you cannot tell them apart if they all are 3 bolt cams. An LS3 specific cam will have one bolt hole instead of 3 but most aftermarket cams are 3 bolt.