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Since you're pulling the head anyway I think it's sound advice to reccomend you measure the bores and CC the deck and chamber. All you need to do that is water, food coloring, alcohol, a graduated cylinder, and an acrylic plate with a small hole in it.
Once you know the chamber volume you'll be ready to calculate your CR. For every .2mm of head gasket you use you'll be adding .398cc's per cylinder if you're still at 81mm.
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