right then an old XR2 maybe 150 hp (mutz nutz manual said 162hp) is built using a 2.4 block and sleeving it down to a 2ltr. the newer XR2 200hp is built using the later 2.5 block but again sleeving down to a 2ltr. JBD posted on another thread how to tell the difference between the blocks, i'll have a look for it