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The only person I recall offhand using them was Ted Eaton, I believe on a customer's engine. John F. may be using them on his "Hoosier Hurricane" & Jerry Christenson might on his "Blackbird", but Idon't know for certain. All three of these gents can be found on http://www.y-blocksforever.com/index.html under the forum, in the technical section. I'm guessing that somebody there has used them, if not those three. I seem to recall Ted saying they were quality pieces; I think they are made by Dove Engineering, the same guys that were the first to cast up aftermarket FE heads, years before Edelbrock, Shelby, etc. Good luck!