I don't think the euro motor has a different bore and stroke.

Check out this thread and ask CTaylor738 about his euro 3.8 liter engine he built for his 380 SL:

http://www.peachparts.com/shopforum/showthread.php?threadid=55631

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".