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I just replaced my originals in 350 SDL with 198k ... Nothing surprising in the installation once I located some 4000 grit sandpaper ... Lapping was easy as mine had no discernible etching ...numbers 2 and 6 were pretty rusty looking ...I did not get popped tested ...
Way less smoke on start up and far less under full throttle ...perhaps a bit quieter ...will check mileage long term, but can't see much reason to get pop tested/balanced based on experience so far.
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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
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