Also as Tim mentioned, the heads are the same. it has to be one of those worthless myths around the net.


And 11:1 CR is too high to be reasonably managable on stock control unit.

Just so that you know, 1992 Galant DOHC 4G63 came with a more powerful engine because it had more aggresive timing and higher CR, like 9.8:1 or something. It is essentially the only car of that platform that came with a knocksensor in NT form.

Looking at it costwise, you would be doing a lot more with fairly little gain when the turboing route is much cheaper.