Originally Posted by Chris Peralta

I have a question for you guys.... Does anyone in here run these GO engines at an altitude of 5,000 feet or above? I am curious what your doing to get power out of them as I have seen several GO's run up here and one was in the hands of a team driver from Texas, and I have not seen the power you all are speaking of with these mills.

Are people pulling out headshims on engines at sea level at all?