I'm not going to argue with you. Glad you can do your own work, so can I. I encourage everyone to do as much as they can for themselves. But I stand by my statement that most people in the hobby, cannot for whatever reason (skill, space, time, tools) port an iron OEM head with positive results that approach the performance level of one of these aluminum heads. Thus, having ready to go options off the shelf that provide a significant increase over stock iron heads, is a good thing. Doing a gasket match on the ports and knocking some burrs off isn't going to take an OEM iron head into the realm of an aftermarket Eddy/ProMaxx/AFR type aluminum head. Getting that kind of result from an iron head takes skills and tools that 90% of enthusiasts just don't have and these days finding a shop that can/will do a set of iron heads to that level will likely cost you the same as a set of Trick Flow 190's.