While looking for a barbed nipple adapter for the vacuum port on an aluminum intake I realized there could be a situation with dissimilar metals. Then I realized the heater hose adapter (appears to be zinced steel) and temperature sender (brass) are screwed in the aluminum and in contact with the coolant. 

I am concerned that this will cause galvanic corrosion, furthermore, the block is iron and the radiator is aluminum.

https://www.lytron.com/product-support/resource.cfm?aid=1239

The process of galvanic corrosion occurs when two different metals are touching each other in the presence of an electrolyte, a fluid that allows the flow of electrons from one metal to the other. As the process continues, one of the metals will deteriorate quickly as its electrons flow steadily to the other metal.

https://www.hunker.com/12502151/screws-compatible-with-aluminum

Whilst researching the above the following re electrolysis came to light:

https://www.northernfactory.com/knowledge/Electrolysis

I am most concerned with the temperature sender (brass in direct contact with aluminum and coolant). Has anyone found a solution or am I over thinking this? I have read on this forum the problems related to corrosion.




.150 Stroked Y-Block:327.25 ci @ >1hp per ci