On a SBC marine engine, do the exhaust valves need to have hardened seat inserts? Or are the induction hardened integral seats sufficient. I find some literature saying the marine/industrial heads do have inserts in them, but in other places saying its not necessary. If you are just using the engine for typical cruising and not running WOT for extended periods would they be required.
If I understand right GM powertrain sells vortec engines for marine and industrial use, I could see in an industrial setting where they might be required because the engines might be runing near torque peak, under load for 8, 10, 12+ hours continuus, possibly even on propane or NG which would be harder yet. Even though a boat loads an engine down more than a car or truck, its still not the same as an industrial platform. I wonder if they assemble the same engine and just sell the same industrial type engine to different parties.
If I understand right GM powertrain sells vortec engines for marine and industrial use, I could see in an industrial setting where they might be required because the engines might be runing near torque peak, under load for 8, 10, 12+ hours continuus, possibly even on propane or NG which would be harder yet. Even though a boat loads an engine down more than a car or truck, its still not the same as an industrial platform. I wonder if they assemble the same engine and just sell the same industrial type engine to different parties.
