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Old 08-03-2016, 11:31 AM   #3
Smallblock454
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Join Date: Jun 2014
Location: LB, Germany
Posts: 1,507
Hello GatorLapis,

green rubber in general is caused by deorientating valve stem seals (german term is Ventilschaftdichtung) – don't know the correct english term.

Regards, Markus
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