RE: mcd evo 3 competition race runner
Don't put a ported head on a CY engine, almost every professional tuner uses Zenoah engines, that has a reason!
To get more power, get yourself a pipe, best for the MCD RR is the Samba pipe and the RN Magic Bullit pipe. Both are very equal to the power output. But the RN was build and tested for a Zenoah 26 don't use it on bigger engines it won't give you 100%.