Im not sure, werent aware of different series engine, its a later model JDM VH45DE which has the newer remade metal chain guides instead of the plastic ones used in the eariler models. So I'd assume its a S2 engine? Cheers for all the positibe feedback, im looking at a complete 300zx for a parts car later this week coming. With more updates to come on the mounts and whatnot. =)