i am wondering if it is a merc ?
anyways i have extracted all the studs now and anything else that bolts into the block.... all went well except one stud which i have sheered off in the block... guess iam stronger than i thought ! on a positive note at least it pulled now before i had gone through countless gaskets and frustration !
GIT !!!!
next step is to get it chemically cleaned and the cam bearings pressed out (and new ones put in)
get the block drilled out now darnit....
bring home, paint and pollish the faces etc prior to rebuild.