Link to the article on Avweb
https://www.avweb.com/aviation-news/superior-settles-one-xp-400-lawsuit/
https://www.avweb.com/aviation-news/superior-settles-one-xp-400-lawsuit/
Just my opinion I am not a fan of hot rod aircraft engines, stroked, higher compression for general aviation, even experimental. The reason certified (config) Lycs and Continentals are reliable is because they are conservatively designed and operate bellow limits. 320 = 160HP max. 360 parallel valve =170HP - 180HP; 360 angle valve = 200 HP. I know custom displacements not made by Lyc, 340's, 390's and 400's are popular.
Now with Elec Ignition and free flow headers even on stock Lycs there is more stress. I am willing to take that risk and more practical now CHT/EGT monitoring of every cylinder is so common.