All good ideas.
Some ideas I like and some I've added.
Perhaps -
- Reduced TBO
- Core replacement at a fair price to get old engines out of circulation
- Reduced margin parts for these upgrades
- Release of affected serial numbers where possible
- Enforcement for owners (this is a major issue and one of the reasons for breakages - many of those that broke had not been upgraded)
- A cooling "kit." New baffles and ducts, something scientific and tested, that is a bolt on "fix." People like a "fix" or a "kit" to solve their problems
- Plenum chamber as an option for cooling like a real Lycoming style one
As for engine components
- Valves that don't warp
- Valve spring washers that don't break
- Thru bolts and nuts that fit
- Increased quality control through known-good suppliers (do they have a QA manager?)
I don't beleive head gaskets are a solution, they would just mask an existing issue.