Many more aluminum big blocks than small blocks. And then when you work with blown stuff that’s all you see. I had a customer that had an all aluminum SBC. Pretty nice piece. He had 300 passes on his aluminum rods and I told him you are on the head of a pin. They needed to be changed. He pushed it and 10 or so passes later a couple let loose. It blew the front two cylinder off the rest of the block. Lost everything but the heads, and his repair bill to me was several times what a new set of rods would have cost him.