Gentlemen: Hauled out some HP exhaust manifolds that have been sitting on a shelf for a few years, (17 to be exact). Went through the casting numbers on them. I have one manifold which is 2843247, (numbers are a little blurry), which shows as LP with a 2.25 Inch exhaust, but just measured it and it is 2.5 inches, which is the same as the other side 2808900 which is 2.5 inch as well. Not sure what to think of this other than they will do the job on a 440, which is where they came from (67 New Yorker parts car). Any thoughts here?