We know we lose some power with current water jacket manifolds, (have tested on the dyno) But there has been little option.
So here is what I am trying to do, these are a screen shot of a LS one that the pattern maker has done, Still water jacketed but nicely flowed. Its not cheap but the result is awesome with equal length runners. If it goes ahead they will be nice and light and well priced due to the lower machining time/cost