So what is the largest turbo that could be put onto a cast manifold before no more power gains are realized? Some say that 700ish rwhp is the max for the cast manifolds, but what if someone got a wild hair and slapped a "larger" turbo on it? Say for example the head would be extensively ported, and polished with 1mm oversized valves, as well as the intake manifold. Say also that the cams would be at least as aggresive as 272, 272. Would there be a point where you just couldn't make anymore HP because the cast manifold would hold you back?
Thanks,
Eric
4 digits