Ive had these pistons for about 10yrs, some guy gave them to me. He said they were for a 440, there is no name on them. Just says .040 over. Inside there are 2 marking an arrow on one side and a triangle with a - on the other. There are 4 valve notches and a 1/4 of it is raised up higher. They measure about 4 5/16. Is there anyway to figure out what kind they are?

7322269-pis.jpg (80 downloads)