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Can anyone shed any light as to why two different (at least the casting # is different) cast iron 6 barrel intakes were made?

Sorry, dont have the #s in front of me, but I seem to recall the #s were sequential. One ending with 5 and another with 6.



The cast numbers for 440-6 are 2946275 and 2946276. Both are cast iron. 275 was early model year builds and 276 was late model builds during '70. I wish I knew the reason for the change...

Also, my understanding is that it was A12 cars that used the Edelbrock Al. intakes in '69-'70 which had the cast number 3412046. But... only death and taxes are certain