Hello
2.0 & 2.2 Marelli are NLA including the finger and the cap as spare part. The distributor is still avaiable 2.4 Marelli are still maintancable but not a distributor aviable.
Porsche also used Bosch units in all T cars.
The Marelli deal had to be done to fullfill the contract.
( Porsche used Marellis for race cars )
Porsche replaced all 911T distributors by the 911 2,7 CIS unit as they have nearly the similar specs. This is to handle spare part storage easier.
So all sparepartnumbers are NLA and the said distributor is the direct replacment.
Sorry I donīt have all Porsche # in my mind.
Identifing the distributor is done by the Bosch ' witch is not identical to the Porsche '
The Distributors are in various stages the early units had been JFD 6 types then came the 159, 169 and the 184 series.
The number behind the typenumber is relatet to the specific version. Warren S had a list with the most used distributors in a recent thread ( 5-8 months back )
However smog equipment or other stuff my force to add advance/retard canister to the base distributor. Iīm in germany and not sure about the US versions. They where even not covered in german shop manualls and books as Porsche tried to avoid gray market sales.
Porsche has the same price for 2,7CIS and for 2,7MFI distributors, they look similar and have only other curves.
In Germany most try to sale the S/RS distributors more expensive as people think they can tune the car to S-specs and will gain the "missing" power.
I would recomend to order the part aat a company who knows what they sale and will assist if problems show up.
You also can rebuild the Marelli unit but like said they are dead end as no serviceparts are aviable and the last NOS make a complete new Bosch unit look like a bargain.
keep in in the box if you think about return the car to a showpiece. The judges will rate originalty and cleanyness over function and if they ask why the engine runs so bad then smile and tell them becourse it has the original marelli and this is the original wear
I think those are the interessting threads:
http://www.pelicanparts.com/ultimate/Forum3/HTML/009677.html http://www.pelicanparts.com/cgi-bin/vb/showthread.php?s=&threadid=32442