unruhjonny - Thank you, that is just the kind of insight I was initially looking for. I too have now come to the conclusion that these were not the original heads and as you say they were most likey sought out by a previous owner seeking to add some much needed compression, I see this as a bonus
Also very interesting how head casting dates would usually be later than engine casting dates on original pairings. I had my suspicions that they would not necessarily match exactly. Again not a problem, I know its been apart before.
Thanks again to all. I appreciate you taking the time to educate me further on an interesting topic
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