Part # for Valve spring seats seals
#2
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Valve stem seals (if you need to change the spring seat, new valve stem seals are recommended) 8x GMPN 12533586 for Int Seal(Black) GM# 12457652 Exh Seal (Brown)
Source: www.ls1howto.com
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Source: www.ls1howto.com
Search button is your friend