Thx Glenn, have a pic and well can't see all th ebolts to see if it lines up its a long shot really, but as I can't find a (cast) dry sump for the rb25 ( already using a Rips extended one but thats not the total cure).
But I have found a cast sump for the L20 engine, you can see my thinking.
Nissan L6 sumps are not interchangeable with RB sumps. If they were, all the people fitting RBs into older Nissan & Datsun models would save themselves a lot of time and money....
Be careful when you're searching for data on Nissan L-gata engines, as there were a lot of different versions made over a long period. Don't confuse the 4cylinders with the 6 cylinders ( 'L20' could mean both, and when the original L20 six - designed back in 1964/5 - was updated in the late Sixties and the 2 litre four was introduced, Nissan called them the L20A and L20B respectively ) and remember that both rear-sump and front-sump versions were made in the L20/L20A/L24/L26/L28 & their diesel variants. There were also some winged 'low profile' sumps in some models.
L-gata sixes were the inspiration for the new RB-series when it was being designed in the mid Eighties in that Shinichiro Sakurai and his team were building a new modular engine series that could be adapted with many variants, but about the only thing they share is their head bolt pattern.