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I always had leaks on my 327 with the aftermarket valve covers and the cork gasket. I think it was mainly the valve covers. I ended up buying a set of Moroso valve cover gaskets from Summit they are neoprene with steel inserts, they are reusable and you don't have to use any RTV. They stopped the leaks. I still have an unopened set in my shed. I think they were $32 for a set. Kinda expensive, but well worth it.
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Active Inliner---bigchevy66
68 SWB Stepside 250 L6/3 on the floor/ Hedman headers, HEI, MSD 6A box, K&N filter, Offy intake and Edelbrock 600cfm 4 barrel
Soon to have: WC T-5 five speed
66 SWB Stepside-undergoing restoration
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