Ok, there is no X in the lifter valley, but there is a "50" cast in there if that matters. I do see the "428" in the center freeze hole. There is also something else I noticed. I've seen NOS service blocks on ebay that had big numbers painted in the lifter valley for each cylinder. I can see the shadows of these numbers in the metal in my lifter valley. Since I have these painted numbers, and I have no casting number, maybe this is a CJ service block? I'm just guessing of course
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Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241