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There are various production changes made to VIN 1/7414 and later K0 series cylinder heads, at least 4 that we aware of.
The image below shows two specific head castings. The bottom (and cleaner) head casting is from a VIN 1 thru 7414 (sandcast), which is the "earlier" casting and the top shot is of a "later" casting. Externally, there is no way of identifying the "earlier" from the "later" casting but once the cam cover is off, it is a very easy process to identify. Main differences are:
1. Later head has no casting depression between rear head bolts.
2.Later head oil return hole more pronounced and better designed to drain oil.
3. Later head has tapered valve guide, and no provision for oil guide seal.
4. Later head has larger scallops on both sides.
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