Casting numbers,codes and markings on head

[Alf]

I'm trying to identify whether my 25 head is turbo or not.

I keep getting conflicting information on what's what and no one has been able to tell me how to indentify a bare head.

Every manufacturer has a number or some code to distinguish between their parts. Does anyone know what the following mean?

The pic below shows the front of the head.

Going by how Nissan date their other skyline parts, the 10 would be october?, the 4 would be 1994?

The I, I wouldn't have a clue...., the same I is also on the back of the head but on the inlet side.

The pic below shows the exhaust side of the head.

This I have no idea what it means.:confused:

PS: if you guys have pics and or can get the numbers/letters of ur heads that would be great ie state what model, head etc.., A reference that could come in handy for us all.

[Spoolup]

Why do you want to know ?

[The Dan]

I'm pretty sure the only difference is the cam lobe size. I see what I can find out tomorrow.

Has someone ported that for you?

[Alf]

Has someone ported that for you?

Yes it's being done atm.

Why do you want to know ?

I'm hearing alot of stories about them, i'd like to see hard evidence, cuts the bs out.

Apart from that curiousity......:blah:

[Spoolup]

R32 RB25DE - 240 in , 232 ex - 7.8mm in, 7.3mm ex

R33 RB25DE - 240 in , 240 ex - 7.8mm in, 7.8mm ex

R33 RB25DET " same as RB25DE

difference is neg

[Spoolup]

I think the only differences are between the non vvt and the vvt.