whoops!!! Ok, well then since your talking about an Ls then just get a full Ls motor and build it. I don't think that the b20 block and Ls head would be a good combo. You could do a b20 block with a B16 head and build it, it could be good for almost 200whp. Or a Ls block with a GSR head and build it and that could be good for nearly 200whp.