List of important features in an aluminum head in order, IMO
1. Make sure damn seats will not fall out
2. Make sure guides have proper fit and are concentric with the seats
3. Make sure there are NO THIN areas or inclusions, pockets, or porosity in the casting.
4. Make sure all drilled holes, threaded fastener holes, drain backs, spring seats are accurately located
5. Use quality raw material and heat treat
6. Make sure the head flows as advertised
7. Use premium parts, valves, springs, locks, retainers. (not that important because you can buy bare castings)
Seat integrity is #1 for a reason. .
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