Indmar Raptor closed cooling

[DaveM]

The new Indmar Raptor engines come standard with closed cooling. Does this mean you don't have to winterize them since you can't drain the block?

[MLA]

Yes and no. There's more to winterizing a boat for its winter lay up, then just draining water from the block. For an engine with semi-closed cooling, the block has antifreeze like an automotive engine, but you still have raw water in the v-drive, trans, heat exchanger and exhaust manifolds, that need to be drained.