Bruce,
If infact both lavs carry two lav genes than theoretically they will breed true. However, if they are anything like the blue genes that I have been breeding then no, you could still have self blue (lav), black and splash babies. Remember self blue or lav is just diluted black.
Daniel,
Everybody says they are not going to breed to sell, but the truth of the matter is that you probably will. If you have any cockerels they will make the decision for you LOL, unless they are isolated. I learned one thing long ago, and you can take this to the bank, NATURE FINDS A WAY, so never say never, whether you intend to or not.
Kurt