[4pipes]

My block has 12,000 miles on it. It's been rebuilt for reasons not attributable to the block. The only issue I know of with the Shelby block is liner movement. According to my builder, they can move axially with temperature cycling. My block was never decked until now and some liners were up or down by about .003 preventing a flat sealing surface for the heads. Common practice is to attach steel torque plates to new blocks for a couple of days to stabilize the liners, then decking them.