From the factory the cam pins go in the middle of the cam gears.
If you change them, you will have the feature of either advancing them or retarding them, but I am not 100% sure which way would advance or retard them.
Stock, as I said, is in the middle hole.
If you want, tell me how much they shaved off of the head and the block along with how thick your new HG is, and I can calculate how many degrees you will be advanced/retarded.
(Although it would most likely be less than one degree.)
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