This is kind of coinciding with another post I have, but a little different topic. I have the manual for this 1974 OMC (800 I believe) sterndrive. In the manual it shows 2 different flushing proceedures for the unit. In one(which I have been doing) you connect a hose directly to the pivot cap on the starbord side where the upper housing meets the intermediate housing.<br /><br />In the other proceedure listed it shows using muffs on the lower unit. Well, my lower unit has no water inlets for muffs as I can see, only 2 small holes on either side of the upperhousing about in the middle of the casing. When I hooked muffs up to those holes I didnt get any coolant circulation through the engine when running, when I hooked back up to the pivot cap I was fine.<br /><br />Any input on this would be appreciated.