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I had him pressure test, make sure they were flat, valve job & seals. I was concerned with that 40P being shaved off also. However - Looking around at other 40P driver side heads, That 40P looks that way on alot of heads. I'm not sure what they look like from the factory, but that driver side 40P appears to look that way alot of the time. I'm not worried about timing being off. Here is a good write up on milling: Milling Heads
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