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06/09/2008 13:33. S.M.'s Craftsman Update between the issues News article on NASCAR announcing the tapered spacer sizes in CTS engines.

Here's the change they made: Engines with cylinder bore spacing of less than 4.47 inches must use a tapered spacer with four 1.125-inch diameter holes, which restricts engine air flow. (scenedaily.com)

All other engines must use a tapered spacer with four 1.1-inch diameter holes, which restricts engine air flow.... // Bleacher Report