Buick engine specifications - 4.1 V6

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I have a 4.1L V6 with a casting #25520044 and determined it was one of many different castings for the 4.1 from the late 70's to early 80's.

I am trying to determine what the factory "deck thickness" is on this particular casting.

Any resources for finding these specs out?

Thanks,
Eric
 
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