ive heard bad reports on here from guys usings wossner pistons on a yb
apparently they are bad for piston slap, but id have thought that would be down to the block not machined correctly
I know of plenty of jap cars running wossners in drift cars etc and having no problems
I saw recently a company on facebook advertising a remake of the original mahle pistons with valve cutouts already in them ,
I have a look to see if I can find there name