Sort of an old topic ,but looking for an answer.
I spoke with Lone Star a few months ago and questioned casting numbers/date codes ? Was told this is a common mistake and no real date code exists like on a carb/alternator etc.. I know a very reputable company , and who I plan to use by either purchasing outright, or sending a set of cores in. I imagine considering they were only used in 67-68 a set for my Z would be correct ?