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While probably a lot more that what you want to spend and certainly not very original, there was a company a couple of years ago putting out new aluminum castings along the lines of the Australian closed chamber designs. They put out some awsome power increases over the old 4V closed chamber. Otherwise, I wouldn't think that 4V heads, while not all that common any more, would be that difficult to find.
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Walkin' Trails
NRA Life
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Firearms Instructor
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