TWAalltheway, the Rolls Royce Tay engine could fit into the No. 2 spot on the 727-100. The JT8D-200, which has a larger diameter than the standard JT8D, would not fit into the No. 2 spot. So JT8D-200s were only installed on the No. 1 and 3 positions and a JT8D-17A was installed in the No. 2 position.