Have coolant in oil and steam coming out of exhaust pipe. Gonna pull the head tomorrow. If no cracks in head or block gonna replace gasket and hope for the best. Will I have to remove the timing chain for this? Had put on a new water pump recently and wasn't that bad. Have done this type of work before (78 Corvette) but not a M/B. Can anyone refer me to a thread that covers this in detail for the 91 300 SE? Thanks in advance.