Are there any internal diff? Outside i know there was a 2400 on the early z but is there any reason you cant swap all of the covers as you please?

No! They all fit all of the Lseries inline 6s!

Will

So how many different looking ones are out there?

PS Since the original question has been answere i though I will change the topic slightly

That is correct! The ONLY difference is the lettering on the top. There are 5 that I have seen and are as follows:

"NISSAN OHC"

"NISSAN 2400 OHC"

"NISSAN 2000 OHC"

"NISSAN"

"TURBO"

"BOB SHARP"

"" <---------this one is blank on top, I believe this to be a modification (i.e. ground off letters)

Furthermore, if you have the 2400 or NISSAN styles and wish to sell them to me for a fair price I'm always on the lookout for one of these.

These are the ones I have seen

Nissan OHC

Nissan 2400

Nissan Turbo

Nissan

and A blank one with No script-was not polished, and did not appear to have been machined(casting marks on the top)

(Oh sure TexasZ beat me to the punch while I was typing...again!)

That is correct! The ONLY difference is the lettering on the top. There are 5 that I have seen and are as follows:

"NISSAN OHC"

"NISSAN 2400"

"NISSAN"

"TURBO"

/QUOTE]

Mine says: " NISSAN 2400 OHC "

My '70 Series I also reads: " NISSAN 2400 OHC "

There is a difference on one of them.

The cover that just says "NISSAN" in big letters is slightly taller. It is a JDM item, and if installed in a S-30 with new motor mounts, you cannot install several makes of strut bar. BTW I just sold my JDM "NISSAN" cam cover, or should say traded away. I have a new PDK Fabrication strut bar and could no longer use it.

(Oh sure TexasZ beat me to the punch while I was typing...again!)

This seems to happen to the two of us rather frequently.

Great minds....

This is what the Nissan 2400 OHC looks like.....

Actually, the Nissan L-series 6 cylinder engine debuted 5 years before the S30-series Z in the 1965 'Cedric Special Six'. Valve covers from the early six cylinder engines won't fit the 'late' heads ( ie E30 / E31 / E88 / N42 etc etc ) because the method of affixing them was different.

Here's a pic of the top end of an L20A six from that 1965 'Cedric Special Six':

Thanks Alan,

Looks like an awful lot like a longer version of a Sr311 cover...perhapse the L series evolved from the changes in its engine?(not to hijack the thread...)

Will