John,
Not sure about miles on them because I bought them used. I have taken them all apart and everything looks good. There is no slop in them at all. I have two sets of cromemoly pushrods for sale.
One set is new. Ordered from postons as stock replacement lenth and 5/16 dia. These have pressed fit ends.
The other is used and they are the recommended Gn1 aluminum head lenth. They are 8.850 lenth and 5/16 dia. These are a one piece type and in good shape. I was thinking $375 for the rockers and a choice of one set of pushrods. Otherwise I was asking $40 per set of pushrods.
Thanks for the interest