SUARA4D SLOT Designated the XK-series in production form, the twincam six was one of 10 powerplants being considered for the new sports car by late 1947, all developed under the "XJ" project code. Actually, the most promising of the lot was a 1,996cc (121.8-cubic-inch) four of 80.5 x 98.0mm (3.17 x 3.86-in.) bore and stroke, and Weslake selected it as the basis for the eventual XK-120 engine.|Macintosh Quadra 630