RTV is still used for rebuilds of car engines!!
There is this small area between the top engine and intake manifold( most all V8)gaskets that you HAVE to use RTV. Sometimes this gap could be as big as 1/4 inch due to angle changes. NEVER had a problem with that RTV coming loose and YES I was around in the 60s but parts were spent in a fog.

Xnavylfr(CHUCK)

BEER,BIKES and BABES since '69Thumbsup