These are used 1G Rods, that came out of a 6Bolt engine. 1G rods are bigger and stronger than 2G rods. They are commonly used in 2G engine rebuilds, replacing the 2G rods. But when this happens, 1G pistons must be used, as 2G pistons have 1mm bigger wrist pin size. So you cannot use 1G rods with 2G pistons. I don't know how many miles are on these rods. But they look in great shape.