ProComp/Speedmaster aluminum heads

There are always reviews or experiences that will both support a part or beat it up. You know this. From what I know of those that have bought them (including personal friend), the castings are fine. Some claim better than edelbrock. All suggest buying them bare and have a quality machine shop assemble, checking tolerances. I cannot argue with this, and I believe if you followed that plan you'll have a good experience.