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Thin Brass plugs on the back ports on my engines Heads what are they there for?

1K views 6 replies 7 participants last post by  gabrio 
#1 ·
its a 1975 Ford Mustang II 2800 V6 i am starting to rebuild the motor and noticed this thin brass looking plugs over the back port on each head, are these required or is some thing to deal with fuel economy?
 
#2 ·
They are called welsh plugs, they are designed like that to give the manufactures access to cleaning the casting sand from the head or block after they are made.

As far as pressure buildup in the cooling system, this is not the case, your radiator cap is designed for that.

I cannot comment about freezing, as I am from Australia.
 
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