Overclocking and intel stock cooler :/

So I put together another system yesterday which has an i5-2500k in it and I would really really like to oc it but I didn't have enough money to buy another cooler. Do you think it would be possible to squeeze 200-400mhz with the stock cooler (3.3-3.7ghz on all cores)? The case its in is a cm storm scout......