Originally posted by riverhorse59
When looking for a block with a high -nickel, high tin mix, the numbers to look forare "010" and " 020". They are cast under the timing cover area.
On blocks with a stronger nickle tin combo there is a third # usually .015 and as for the mexican block they have an M in the casting # and no the M is crap metal. Look for 2 bolts w/ 3 sets of .0xx #'s not just .010 .020 those are standard.