Just below the
oil fliter mount are:
E
2L4
These are the only "meaningful" numbers. So how do I know it's a 1968? Service blocks did not have numbers, like mine. Only the late model (1968 for instance) blocks were drillled for hydraulic lifters. Plus their are "ribs" cast into the external side of the block for additional strength, again only the late model blocks had these. And of course the side oiler galley is visible AND "drilled" for carrying the
oil. I understand SOME late model blocks were cast as side oilers but the passage was not drilled and there were "center oilers".
352 is cast in the front of the block but all FE's have that. Next to the lifter holes (under the intake) are: "427" but MOST (all?) FE's also have that.
The late model, "ribbed" and cast for hydraulic lifters is the best 427 side oiler block out there.