I have been reading up on all the research and stats for the aluminum 3919842 heads and the infamous changing core plug. On my 68 L89, one of the heads has two plugs and the other has no plugs, I always assumed that the no plug head was a later replacement head. Well I just pulled the heads for my first time and what a surprise. The head with NO plugs is dated 7.13.67 and the head with two plugs is dated 11.28.67. Also on the NO PLUG head the p/n has the first digit "3" stamped with the rest of the p/n cast. In the attached pic you will see that the square hole is present yet no plug. Can anyone shed some light on the early date code 842 with no plugs?
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