There was a bloke probably 15+ years ago, (fat Rick) that claimed he worked for a brief time at datrally. He also claimed that they were stroking A-series to mid to high 1600cc back then very successfully. I would not have taken too much notice of him except he was well know for building top fuel motors and aus car engines on the side. The only thing I remember was him saying something about nissan 6 cyl rods and im sure an L series crank.