Firstly "blue top" is usually used to describe the older style EV1 injectors. AU's use the EV6 injectors, and the plastic body of the injector is all the same colour (not just the top). Just because they are blue does not necessarily mean they are 24lbs e.g. the 39lb SVT Cobra injectors are also blue. You really need to check the part number on the injector to know what spec it is.
The AU series 1 V8's did come with either orange 19lb injectors or blue 24lb injectors, though there does not appear to be any pattern to what they ended up in. I have heard of XR8s with the orange 19lb'ers, and Fairmonts with 24lb'ers.
It would seem as though there was just some old stock left, so injectors on series 1 AU V8's are just luck of the draw...
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AU XR8 Ute 13.90 @ 100mph - http://www.aufalcon.com/xr8ute
5L Windsor, GT40X heads, Crane 2030, Pacey 4-1s, Lukey 3", 3.91:1, auto. Tuned by me w/Quarterhorse and BinaryEditor.
Coming Soon: Ported lower intake, Tickford "Premium" Brakes, and a good wash.
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