Marine Intake Manifold | Chrysler 4142957 Cast iron intake manifold fits Chrysler LM318, M340, and M360 marine engines with Rochester 4BBL carburetors. Chrysler small block intake manifold Marine intake manifold used on Chrysler LM318, M340 and M360 engines with Rochester 4BBL carburetors from 1986 to present For raw water and closed cooled applications