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The guys to answer your question is Mercedes NA-
Write them!! I'm nearly positive he is mistaken. To my knowledge there was never any aluminum alloy heads for 616/617's and no factory turbo charged 616 applications.
Marine stuff ussually is not lighter... it was just not emission regulated for many years.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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