[martinker]

Just did a different search looking at PN's and found this thread.

http://forums.pelicanparts.com/911-engine-rebuilding-forum/776570-2-8ss-build-3-0-turbo-engine-questions-2.html#post8059854

So guessing the 930.104.341.2R was used on the 3.0 and the 930.104.341.3R on the 3.3's. If that assumption is true then the 2R does not use the special alloy, since it has a "Y" stamping instead of the "RR350" like on the 3R.

Also it seems like the 3.0l were fully finned looking at the thread below?

http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/1017445-930-50-engine-sale-1975-turbo-3-0-a.html