There is only one or two. The best is "Y-BLOCK MAGAZINE". It comes out every other month. It is only available by subscription which is something like $25. No website. For info contact yblockmag @ yahoo. com . Take out the spaces for the address. Dont expect it to be fancy, it is in black and white, but has more info than any other magazine.
As for over the counter mags, it is so rare that they carry anything on Y-blocks, that if they do someone here or on the 48-60 forum will alert everyone.
john mummert who rebuilds y blocks in so,cal, was suppose to put out a book but never did.it was going to cover everything and would have been the best.he was always just a few months from finishing.havent heard anythine for a couple of years now.