I always thought the 3.4 was stroked not bored. 350sd/c36 crank, with short m102/m111 rods in the 980 block.

The 91mm bore of the 3.6 is already pushing it, I wouldn't want to go over that. Remember the head gasket trouble the Brabus 3.6 m103 used to have.

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87 w124 zender 3.6 - 3.0 kompressor in progress!
96 w124 e300 diesel - slowly being modded
98 w208 230 kompressor - m103 testbed SOLD.
96 s124 om606 superturbo diesel 508bhp