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I have a alloy 45 flathead which I think is military as it has a "5" stamped on the edge which I also believe is the compression. In addition to the normal 119-39 casting/part number stamped into the combustion side of the head is stamped EX F 54P. The F is for front, leaving the EX and 54P which I could not figure signified (if anything). Anyone can help? Thanks. 100_1504.JPG100_1505.JPG
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