The S30 parts constantly evolved over the years and not at set periods - Nissan introduced changes (sometimes improvements) asap in mid-year/production model runs.

This also applies to the cast-iron exhaust manifolds and so far for the 240Z alone, I've noted the following cast numbers (visible under the ports 5 + 6 :

U87

N42

N47

N33

E30 - this I know is the European version.

Generally, I believe, the different parts denote different methods by which Nissan passed their cars through certain anti-pollution controls (?) however all appear to be of the same dimensions......except the 1973 (last) version before the introduction of the 260Z..

This manifold is longer towards the flange which is itself at a slightly different angle.

This means that the 1973 downpipes were shorter than the previous AND post versions and I'm trying to foind one please.

In the absence of the real part, I'd would like to at least know the casting code, please, on the 1973 OEM exhaust manifold ?

Can you list here any other manifold casting numbers with their car model and year please ?

Many thanks in advance.

I'm using a U-98 manifold which I bought in Australia. It has no emissions ports in the casting.

1 minute ago, 26th-Z said:

I'm using a U-98 manifold which I bought in Australia. It has no emissions ports in the casting.

Thanks - another (perhaps market specific ?) - the U98. Do you know which year (s) please ?