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I have several small block Chevy intake manifolds with the casting # 3927184 they are all oily and dirty and have been sitting on my shelf in a heated garage for years. All the threads are in good condition and with the oil splash shield. The date code on the one in the picture (F.4.8.) If your looking for other dates I also have these. (L.6.8)(L.11.8.)(F.18.8.).If your interested in these let me know so I can send you pictures they are all the same price.I have over 100 SBC cast iron intakes for 283/302/307/327/350 from 1956 to 1980 just let me know what your looking for.