Quote:

---

I'd grab another block. See recent post on .060 over pistons. Also, 440's apparently like to split at .060 over. Much better if kept to .030 over. Not what you want to hear I know. Got one under the bench myself. Building a 400 based 451 now.

---

440 splitting at .060 I've built a bunch of 440 blocks that where 4.375 and 4.380 and I have never split or heard of a one splitting at those sizes. I'm not saying they won't, what I'm saying is that is not common As far as the piston alloy one of them requires a lot more cylinder wall to piston clearnces, the one that uses less clearances seems to be a little more delicate, the skirts are not as hard as the other alloy, but there is not a problem with wear on the skirts on the street using them I stared using the closer alloy pistons back in te early 1990 based on not wanting the pistons to rock as much sideways when reversing directions on the power stroke, I wanted the ring seal to stay as good as I could get it It worked My memory doesn't allow me to say the proper # for that alloy, sorry