440 Piston Question

Hey everyone, I am building a 440 and I have a set of SRP forged pistons on a set of 6 pack rods. I also have a set of Eagle H beam rods. I would like to put the SRP pistons on the H beam rods but my machinist is hesitate about pressing the pistons off in fear of cracking them. Has any one else heard this or experienced this? Thanks in advance.