I have a nice set of OE BBC Merc. manifolds and risers in good shape. Coming off a running fresh water boat. I am willing to separate the manifolds or the risers, but I would only sell either both the risers or both the manifolds or complete. I dont want to gte stuck with one riser or one manifold.
Both are in good shape, I see no signs of corrosion on exterior and no leaks. To my understanding they were media blasted and repainted in 2008. There were only 80 hours on them when I bought the boat last spring.

Make me an offer.