This might be something to argue about, but my sources says 80.98 bore and 48.00 stroke, which meant a capacity of 2967cc, missing out on one percent of what was legal at the time, When everyone else was in the 2993-2999 cc range.Onch wrote:81.0mm/48.5 mm.
Not not sure what is so special about that though?
Ferrari engine was 80.0mm/49.6mm...