So is it worth getting ure head ported if u don't upgrade the valves or not ? is the 3k-b heads valves different to the 4k head ?
As ive purchased the 3k-b twin cars there port/runners is around 31mm but the 4k head is oly 28 ish mm
shorely it would be worth getting them to the same size. Same as the exaust ports make them same size as extractors