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mcarnage59:
Hi everyone,

Can I ask why people refer to them as "freeze plugs" aren't they welsh plugs and a product of the sand casting process?

GEOFF289:
I think they tend to be called freeze plugs in the US because in the absence of correct anti freeze that actually happens in many parts over there and pushing out the plug as the path of least resistance is better than cracking a head or block or something when frozen coolant expands compared to its liquid form. I think welch plugs are just a bit of local idiom.

Either that or I'm completely wrong.

booah:
We used to have to remove the freeze plugs/ frost plugs to install an electric block heater, depending where you lived it could be one or one on each side. Don't miss those days, brrrrr

mcarnage59:

--- Quote from: GEOFF289 on January 18, 2018, 05:15:08 pm ---I think they tend to be called freeze plugs in the US because in the absence of correct anti freeze that actually happens in many parts over there and pushing out the plug as the path of least resistance is better than cracking a head or block or something when frozen coolant expands compared to its liquid form. I think welch plugs are just a bit of local idiom.

Either that or I'm completely wrong.

--- End quote ---

Ok I thought they were part of the casting process primarily. Its a wonder they included them in Aussie built cars. Back in the dim dark ages I was returning for Barwon heads after setting up my mum and dads Xmas holiday camp. It was very hot 40C and the old XR did'nt like heat at all.  One of those things where you were frightened to stop as the only thing stopping it from boiling was the air flow at speed. Poor old beast blew one of the little welsh plug's out the side of the head.  :cry: No mobile phones in those days.

GEOFF289:
Maybe we should call them boil plugs or something here?

I guess virtually all Australian engine block casting is using the same tooling as used in other parts of the world. Your old XR Falcon, whether a 6 or 8, was running an engine the same as US Fords of the era.

Exceptions might exist in GM products but even the original Holden grey motor was based on the Chev blue flame 6 pack engine series. I'm not so sure about the red and blue Holden 6's and I guess the 253/308's were entirely indigenous.

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