they have been improved since the serious issues they had
I think they are post 07 but some tuners offered them with
sr20de cranks machined to suit which are full counterweight
and better for high rpm and I believe they where 2.3L.
Dont think these mob still offers them from lack of interest.
They are an ugly thing and many datsun folk have built L series
with the ka24de head in various forms and cost.