Well I did leave out I am not the only one building the engine, I will have help from a person who has far more experience than me plus mechanics and people who HAVE done the volvo head conversion. It also won't be a strict N/A because I will turbo the volvo head conversion later. Secondly this isn't just building an engine and slapping it in a car, the car itself I have sanded and painted and so on, and of course I have had help with it to. The only proof you will need is when I am finished with the engine I will show it which should be about 2 years from now, step by step. It rly is mix and mix. Some people had rly no experience with the engine and just worked with the mechanics. Some have built several cars before their volvo head project. DUDE I did mention CFM, I said it flowed a little less than the esslinger (about 10 to 20) and that is with the volvo head's miniscule port size compared to the esslinger.