The intake manifold/valley design on a SBC allows engine oil to splash up under the intake exhaust crossover runner. This oil 'cokes" and turns into ugly black residue. Hard to keep your oil in good shape for extended periods with this design.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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