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I also notice a X stamped on the head above the 4 on a head boss.
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That's great.
There is a thread on these heads somewhere. It was never decided that there was a separate marking on them. This is the 1st example that I have seen.
(except would have thought the 350 HO head would be marked)
Post more on this, please. Also have the pair?
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John Wallace - johnta1
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