These heads have 6 individual intake ports and lumps aren't going to help it. These engines were also built more with a performance goal in mind because of John Delorean's involvement with them and don't have a lot of the shortcomings that the Chevy 250 engines have. I think he mentioned his next build was going to be a turbo version, meaning this one maybe. I also saw some head flow data on a ported head and dyno tests on several engines on another site a while back. They have a lot of potential for sure.