I just wouldn't, especially as it is the 22nm Ivy Bridge chip. Generally, the heat spread is better on the 2500k, making it better for overclocking, but I do prefer the 3570k.
There are some inexpensive coolers that you can get that will mean you can overclock the 3570k with much less worry: http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134&Tpk=freezer%207%20pro%20rev%202http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099&Tpk=hyper%20212%20evo
I would reccomend the 212 Evo if you are thinking of buying one of these coolers, especially as in America it is the same price as the Freezer 7. (I am in the UK, the 212 Evo is much more expensive here)