It's the amount of time it takes to design all the cores and patterns that is the issue.. I started modeling heads for the Ford v8 60 awile ago, but there wasn't enough interest in them to be viable.
Probably would have only sold 10 sets and by the time all the molds were done, it just wasn't worth it..
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But the water necks that go to these heads have been very desirable. I guess they all got lost or broken off...
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A close replica could easily be cad modeled. It ain't rocket science...