[awbrown]

According to everthing I have read , the factory method was a good sized LEAD hammer . I had one for years and used it for this purpose only it is still in the bottom of my tool box and it now resembles more of a pancake than a hammer but it still works for the intended purpose... I would recommend drilling and tapping and the best way to insure drilling straight is to thread some threaded rod into the holes in the bolt bosses on the front of the block and have a friend sight it from the side while drilling.. I did lose one off a 327 once drag racing it so if you plan on useing it hard I would drill it ...