Black spark plug shrouds 2V

They go OVER the tube not IN the tube!
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Yes, there is a sleeve pressed in the cam cover. #52 in the picture below Part #112903
. My car is May '77 #21561

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Early 308 have more of a "plug" that presses into the camcover (and no "tube" 52 as in Dockboy's post) -- item 25 here:

https://www.ferrariparts.co.uk/Diagram/Ferrari/308-GTB-1976-Fibreglass/039-Engine-Ignition

The later 308 got the tube added and use the "shroud" that goes over the tube (the high item number for the tube in Dockboy's post is evidence that it was a later design change). I thought there was an SB for this, but I can't find it (but my recollection is it happened circa 1976-77 so Andy's car might have either). You can't mix-and-match -- if you don't have the tube = you need the plug; if you have the tube = you need the shroud.

 

Interesting Steve, but my car was built 7 mo. before tuttebenne's??

 

As I said, I think it was an SB so (in addition to F not always doing the tightest design switch overs and engines sometimes "recirculating" in the factory) early cars might have been updated -- or did you buy your car new?

 

Bought it in '78 from Ferrari of Atlanta. I will dig through some of the original FAF invoices to see if there is anything on the SB.

 

I bought the early type plug well seals from SF UK last year and they fit without issue in my July '77 car. Just a nice, snug fit. So perhaps an issue with their most recent batch?