RTV= Silicone based gasket makers, or more commonly known as "the gooey red/black/blue/grey stuff in a tube" They can squish out and get into the water passages behind the pump and foul things up.

The spray hi-tack red worked on my '60 235 water pump. Spray both sides of gasket and stick gasket on pump, then bolt pump to engine.

good luck,

chip


Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes