Tappet chest covers

[e-type]

Can anyone help with dates and models for these tappet chest covers, they are all different. I don't have the pipes for the swan neck type covers.
The Parnell book gives me this:

No 2 from left, could be 998 Cooper from Sep 65, maybe also 1275
No 3 from left, must be oil separator introduced June 64, for 998,970,1071,1275
No 6 from left, swan neck with old gasket design. 997 from Feb 63, 1071 and 1275
No 8 from left, early 997 ?.

Tappet chest covers.jpg

[NZmember]

My 67 Elf 998 engine has swan neck like 4 and 5.
Doesn't come with a down pipe. I have a couple of down pipes but they don't appear to fit over the swan neck and there is no stud on the closed fuel boss to attach it to.

[Dearg1275]

The no 8 from the left is interesting. For the early 850 “works” cars two tappet chest breathers were specified. Using one of these with a standard swan neck would get that job done. I always wondered if they used a bespoke cover or took one out of the parts bin from other models.

D

[e-type]

No 8 came from a 948cc, but think it is the same as 997 Cooper. correct me if I am wrong.

[gazza82]

No 8 came from a 948cc, but think it is the same as 997 Cooper. correct me if I am wrong.

948cc In-line block ...

[Exminiman]

Re pair 2 and pair 3 (concave and convex)

Have seen both of those on 65/66 S`s - is there any logic as to why one should be fitted over the other ?

As they tend to block up, presumably they would of been replaced as service items back in the day ?

[Lakeland997]

Here’s my ‘62 997.
Not like any of those