I hear that the later models are not as prone to it..but I don't know if '93 counts. How many miles? Also, what makes you think it needs a new head? The .970 came with updated #17 or better heads that shouldn't have any problems.

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k