When you did the head job, did you check flatness of the block with a straight edge & feeler gauges? It won't matter a hill of beans how good the head is if your block is warped.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.