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Block is same for all M10...more (archive)
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Posted by MartyR on May 06, 2001 at 16:10:11:

In Reply to: Do all 320i (80+ models) have a 2.0 block with 1.8 posted by head? - Marsmann on May 06, 2001 at 15:29:15:

The head on the '80-'83 320i's is a 1.8i head...combustion chamber is different from that on the earlier head ('77-79, the E21 head). The heads, however, are not so different that they cause a 200cc variation in engine capacity; it's the STROKE that is different.

The 2.0L engine has an 89mm bore and an 80mm stroke. The 1.8L engine has an 89mm bore but a 76mm stroke (I *think* it's 76...may be 74, can't remember).

Marty
'73 02

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