[modeleng] [modeleng]making cores for castings

Hi to all, 
I wonder if there are any of the list members that make their own castings?

I am wanting to make some steam cylinders of my own design for my steam launch 
for the Vee Twin that i will be building.

The patterns are not a problem, but i wonder if any of you have made the cores 
for the stem ports on a cylinder before and might be able to give me some 
advice.

look forward hearing your advice.

Regards John Burridge

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