That was the first thing I did. I am used to seeing weisco pistons with the complete part number stamped on them. This piston has nothing, but 50 on it.:">
ya'll said it is a 66.5 mm ! I am asking because I don't know . But I mesured the jug & piston with digital calipars & both are 66.0 mm . what am I missing ?
The cylinder for that piston should be @66.5mm, the piston will be slightly smaller than 66.5mm. The designation on the top is the intended bore size....hope that helps