I remember in the late 70's one Nigel Brendish had a Chipmunk (G-MUNK) in which he installed a Lycoming 260 GTSO. Took about a foot off the wings too!
Then went to Calais, inverted all the way, from Southend, to set up a new record across the oggin.
A couple of years later he was killed doing hairy aeros over Ipswich airfield in the same aircraft I think.
Come to think of it, the Chippie was a lovely aeroplane.