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It would probably be close to a 340 as the 340 is the same engine block as the 318. The stock 318ci has a 3.910 in. bore with a 3.31 in. stroke the very same stroke as a 340ci. The stock 340ci has a 4.04 in. bore. The .060 in. over bore would result in a 328ci engine. The formula for this is, 1/2 bore x 1/2 bore x 3.14 x stroke x number of cylinders.

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