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If I'm not mistaken, your MB has the single cam 103 motor.
Mine runs just over 80 on the highway in a very warm climate with a/oc on.
If you are running over 90 on the highway(a/c or not), I would start looking for the reason why. Could be things unrelated to the head work..ie..t-stat/old radiator/debris on condensor/radiator/etc.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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