[Alan Roehrich]

I think (going by memory) that is the old deep dish 455 piston. Should be around 4.120" diameter, plus whatever over size is marked, have a deep dish (maybe 0.250" deep, and almost the full diameter of the top of the piston), 5/64" compression ring grooves, a 3/16" oil ring groove, and compression height should be around 1.760" (going off of memory), with a 0.980" pin. Useless for anything but a very low compression engine, around 8:1 or so, unless you deck the block a bunch, and mill the heads as well. It usually comes up about 0.060" in the hole on an undecked block.