99% of them are alu here in europe. Its very hard to find a good copper heatercore.
As for a block that can be made on a lathe try serching for the block used with the zalman resorator or what ever that thing is called. IIRC thats a ok design for low flow and can be made on a lathe.
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aka. slater3333uk - The self proclaimed 'Middle Player'
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