Best and easiest way around this is to use a tin catalyst...
You can even make this yourself if you want. But I have proved they work in Peugeot engines that work hard, they can easily transfer from car to car and they last almost forever.
If anyone wants to question my judgement on this, be prepared for a long and bitter fight. I covered 1800kms without one a few years ago after dressing up the valves in a head, that trip cost 0.015" from each exhaust valve seat.
The valves were adjusted at that time, the tin catalyst installed and no further erosion took place in the next 80,000kms!
I then started to suffer erosion again and contacted the maker. They advised that there was fuel being sold with fungus in it, that I should clean the tin pellets inside the canister with bleach or sandpaper them. I did both. Another 80,000kms without erosion.
There were no other changes made to the engine initially, though there was some minor maintenance (plugs etc) along the way during the 160,000kms over the next two years.
Heavy use, often hauling a loaded trailer, virtually all highway miles at constant speeds.
I trust them implicitly.
