Doe's anyone know what grade of cast aluminum is used to machine a engine block or is it machined from a billet. Also would like to know what filler I should use to weld up a cracked hole in the back where the transmission mounts. I think you would call it a boss where there was a steel plug inserted but the whole side broke out, which I experimented with on my tig using 4043 & then tried 5356 filler both seemed to take very well, but that said I still prefer not to guess or through just anything in there like I see so much of. I think most Professionals know what I mean. NEED TO KNOW WHAT BASE MATERIAL IS " BEFORE "
WELDING IS DONE. Don't care much for junked up repair work.