Cylinder head water manifold (early)

[Bob Culver]

It is getting off the immediate topic, but some sort of anti corrosive is very desirable. The difference in typical car engines post 1970s when additives became common and the typical Seven  is amazing. With Sevens the high loss rate is irksome although a catch bottle will recover much. I suspect corrosion with a drained but moist block accelerates. I don’t know what effect is of additive is in that case.

Here we have available Type B additives which are much less expensive but not anti freeze. Used in competition as retain full specific heat.