Oh dear God! 318 stroker

273 said
A lot of people say that they can, don't know if true but 60 thou is only 30 short of 4" and there's off the shelf pistons.

Poking a 'teen 0.090" over is pushing things in my mind. Piston availability is not the issue, metal in the cylinder walls is. These are not thinwall castings for no reason.
I would not do it!