hi
i have a friend that has a 440 block with a crack just like those !
it is actuau a 493 cu stroker .
we sealed it with a external epoxy .
if you pm me i will get the brand .
we cleaned the block paint off with a die grinder with wire brush , then hand scoured it with 60 grit sand paper .
put pressed epoxy on firmly and let it cure .
no more leaks ! 2 years + .
his crack extended to the freeze plug hole .
he races the car 6 - 8 times a year . <street car>
I witnessed my boss fix an exact crack as the op in his buddies freshly built 383 in a rr. Moroso a b epoxy, was still good yrs later when his buddy sold it.
