Oh man, this is painful to hear !!!! good luck on this man....

Question: is it possible to get custom head bolts that would match the new thread caused by the wrong tap you used? does anyone know if this is possible? it could make repairing this problem easier....maybe some of those aftermarket ARP studs/bolts or something like that could work......even some regular non-stretching bolts.....you always re-torque them after a couple of hundred miles ....

good luck

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1993 300E, 2.8 M104 .....