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Brass. brass wont corode like steel does.
 

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I wholeheartedly agree with blue, go with brass as the steel ones will rust out with time whereas the brass will last much longer.
Shane
 

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A person could argue that a cast iron block should have rusted years ago, because iron rusts and corrodes alot faster than steel

I haven't been able to find any real answers about that either, but this is what I think: brass will expand, when heated, alot more than steel will, making sure there's no chance of a leak
 

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Brass
 

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True cast iron does rust, but it also creates it's own barrier against further rusting in the process. I work in power plants and that is the theory they use to prolong the life of all of our piping. As long as the pipes get a good coat of rust inside of them then they are protected. Can't say as I really uinderstand that idea but it does seem to work. Also I know due to the thickness of the blocks vs the plugs the plugs will rust through in timewhereas the blocks do not while the brass cannot do this.
Shane
 

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I went w/Brass on the 78; as per milodon. Cost a little more than steel, but the rust factor was the rust/and resultant leak factor was the main concern.
Kit was only $12.00 so the price wasn't concern in the end.
 
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