I've had trouble removing dowels in the past that were .500". I need longer (and offset) dowels in my current motor. Hopeing to weld fine thread Allen's (head to dowel). Then using a piece of tube , flat washer and a nut to pull them. Tried heat on a previous Mega block and cracked the right dowel bore. Ended up boring the hole. Plugging the hole and reboreing a new dowel pin hole. Dont want to go thru that again.
Doug