love the comments on the rb31 block
i read his thread the other day
he has made it an rb26 open deck with new sleeves, rods and pistons and an rb30 crank
give a better bore-stroke ratio or something and is designed for driveability, torque and response
he has put a lot of work into it but its still in testing and will eventually be on sale once everything is tested thoroughly
on topic, if you want more displacement then you can't look past an rb30 with the 4wd adapter
r.i.p.s in nz will make you a forged bottom end with the adapter and ship it to oz, bolt it in, add your head and away you go