318 dodge polysphere parts 7.99K viewsNovember 17, 20160 Scootr-the-pinstriper November 16, 2016 0 Comments Are intake manifolds and valve covers available for 318 Mopar polysphere engines? 1 AnswerActiveVotedNewestOldest 0 DMarv Posted November 20, 2016 0 Comments Thanks for your question. Unfortunately Offenhauser does not make an intake manifold or valve covers for the 318 Poly engines. Register or LoginOffenhauser Sales Corp, 5300 Alhambra Avenue, Los Angeles, CA 90032Phone: (323) 225-1307