I am trying to figure out which direction to go with my eta. I am currently running a mark d chip but still have the 2.93. I have a 4.10 to put in but don't want to run the high rpm that are associated it as I drive on the interstate frequently. Right now, I am planning on doing the 731 swap and running the 323i cam, mark d 327i chip, etc. I am very familiar with what is needed here so no need to tell me that I will need the intake, afm, etc, etc. What I am wondering is if anyone produces a cam that would be comparable to the m20b23 or m20b25 cam for the 200 head. I do know that I will have to install dual valve springs. I also know that I can run the i camshaft with the appropriate machine work to the head. The thing is, If I go that route, might as well do an 885 or 731 head swap. The reason I ask this is I have read in several places that the 731 head and the 200 head flow roughly equally. The advantage to the 731 head is the 7 cam journals instead of 4 found in the 200. I drove a friends dyno-tuned e21 327i with 10.5 cr and 200 head with a schrick 288 cam and it was a blast to drive. I feel that cam is complete overkill with the 200 casting, but damn, it felt good! If I can figure out a way to run the 200 head in my car now with just changing the valve springs and dropping in a 4 journal high lift/high duration cam with the other i bolt on's, I would be happy. I know I can do this on a weekend in my garage without having to tear the motor down. Also, I have searched, read, re-read, searched again and this has to be the most confusing topic I have ever delved into as their are so many opinions on this and very little first hand input. Please don't tell me I should do an m5x, or m20b25 swap. I am considering those options as well. Having driven a 327i car and owning a chipped eta, there is a huge difference between the two. Thank you in advance for your input.
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