See if some of these past threads help.
http://www.y-blocksforever.com/forums/Topic38973-6-1.aspx
http://www.y-blocksforever.com/forums/Topic41095-3-1.aspx
http://www.y-blocksforever.com/forums/Topic35870-3-1.aspx
http://www.y-blocksforever.com/forums/Topic41095-3-1.aspx
http://www.y-blocksforever.com/forums/Topic16188-3-1.aspx
And here’s a thread that starts a discussion about the pushrod cups being undersized on some of the replacement pushrods for the Y.
http://www.y-blocksforever.com/forums/Topic26796-3-1.aspx