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If you look at the engine code it says 454 4 BL HC ENG on one line and the line immediately following it says 454 5 BL HC ENG. It is like someone copied a cell in Excell and when it dragged it the number rolled up one - Very suspicious.
I have a LS5 from Arlington with a Build Sheet and they did spell 331 RATIO ALLE - just like this one. Never noticed that before.
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I think both lines say 4 BL HC. And double entries is not at all uncommon for Arlington docs. You have to remember, this info was manually entered by humans!
As for the authenticity of this particular sheet,..............
