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Nice used original pair of 1974 Plymouth Road Runner 318 Exhaust Manifolds. Casting numbers 3671398-400. 10-2 and 10-5-73 dates. Say 318 RR on them. Never had a heat riser. Thanks for looking in our store. We combine shipping. Satisfaction guaranteed or your money back. If you would like to speak with me directly call Chet at 401-397-1825.