I was thinking it was the 145mm rod too but if I calculated right, the CR on that is tiny. I checked EPC and while all other M104's either carry M104 or the M102 number (149 or 145), EPC listed the rod as an HWA part # (AMG Specific), though there are plenty of non HWA parts in the motor.

Just remember, BMW turns 8k on a 91mm stroke 139mm rod in a much more distended engine.... Hence my inquiry.

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1993 190E 2.6 Sportline