This is the tool you need to get them out.
Click here =>
http://stefs.com/bandb/products/prod...npullerset.htm
If they are frozen in or if the ends are mutilated from the vise grips then you have two other alternatives if the block casting can be drilled from behind the dowel pin then you can drive it out with a hammer and a drift. If not then you need to EDM it out.
Hope this helps and hope you don't need EDM.
Ed