Is it possible, to impement PoS into a pure PoW-Coin?

[Jherek]

Hello,

I was just wondering, how much effort it takes to implement PoS into a litecoin clone, when it started as pure PoW. I already looked at the sources of PoS coin clones and compared them to Litecoin and it seems the sources are totally different. I am not very skilled at C++, but I can read the code a little and want to experiment with changes on a testnet. Is that even possible or would it need to completely rewrite the daemon?

[lovecoin99]

no, if the pos add new blocks for pow

[DonQuijote]

Use Yellowcoin (scrypt and Pow/pos)