Does anyone know how to identify Pistons? I have eight in a box but have no clue what I actually have. Stamped on the inside is 255-98 on the outside L2482 .030

 

Looks to be a 4 valve head design ,measure across and that will give you the displacement I would think then some computer surfing and you will find the answer,looks to be .030 over too so they aint a stock piston