a popular cam casting...used on, but not limited too, the Fomoco C4AE-B / C8AX-C / C8AX-D and numerous CS Shelby (Autosport Products) cams...I have listings from Camchaft Machine Co.(the mfg.),late 60s /early 70s vintage, with all the #s and conversion to DANA/SEALED POWER/MELLINGS/TRW etc...I think Dave Shoe copied them several years ago ???