Sorry for the delay to answering the Trivia question re the # of head bolts.
It was 18. Each cylinder was equally surrounded by 6 bolts (at 60 degrees apart, duh) which is very logical. LR dropped that pattern, and without logic, kept the bottom row of 4, and altered the spacing around the cyliners, not smart when engines were producing more HP, with the resultant increase in cylinder pressures.
When it became evident that the bottom row of 4 bolts was the likely cause of so many head gasket failures, due to the uneven tension, they dropped that row, because there were so many engines out there.
I have one of the old 18 bolt Buick blocks (and the heads) and I justify not having junked it out by telling myself, since it's a good block, that someday I'll build an engine from it. Later 14 or 10 bolt heads won't work. I took a picture of the block deck to post here but the picture turned out to be 1.72 MB, and I'll have to go retake it in some other mode.
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