I am currently building a 410, but I am having trouble locating a set of standard bore pistons. Any help would be much appreciated.

 

Summit has cast Sterling 381P pistons for the 410 but they are backordered at $10.69 a hole you could also try ford power parts, and I've heard NAPA even carries a piston for the 410, if nothing else order the low compression 390 piston on the condition that you'll take it if it measures to the right height

 

 

try www.kanter.com they show them. I'm sure they are cast because if I remember right they were quite inexpensive . I built a 410 and found this site after I spent $400.00 on a set of pistons.