So, I found an ipd kit for a 3406e with 1456700 steel top marine pistons(14.7:1), selling for about half price. If I've done my research right, it should fit into my 3406c so I bought it. I like the idea of the ipd crevice seal liner. Of course I'll have to get a different head gasket, but might be best to use a genuine cat gasket anyway. Next puzzle will be injector nozzle selection. Since this piston was never used oem with a mechanical injector, I won't be able to match it through Caterpillar. Need someone who knows the spray pattern of the heui injector and a mechanical injector nozzle that will match... anyone out there with a thorough working knowledge of these systems? Reading through old posts, ynot sure comes to mind!