I am replacing the manifolds and risers/elbows on my 1984 Mercruiser 228 and can't figure out which gaskets to use between the manifolds and riser.
They sell 3 different. (4 hole, 2 hole and no holes/blocked)
Mine is full raw water cooled so i assumed I need the one with 4 open slots. The one with 2 open slots seems to be the most common.