Re: Mercruiser New Flushing Procedure
TX, they are worried about water being injested through the exhaust....with the advent of roller cam/vortec motors there is alot more valve overlap in the cam timing, which at low rpms allows water to suspend relatively high in the exhaust stream..a misfiring cylinder is all that is needed to allow this suspended water to 'revert' back upstream and fall into the exhaust manifold and then into a cylinder via an open exhaust valve...not a good thing.
