NIB 427 bbc pistons.One set is +0.060 12.5/1, pin bores cut for ff retainers at factory,they are 50 grams heavier than stock so it is reccomended that the assembly be rebalanced when useing them. One set std. 11.5/1. Pins are included. I got these around 1970 when I was running 427bbc in the drag boat.