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If you mean a 6.2,I think GM vans used shorter injectors than the trucks did due to clearence limitations in the engine bay...not sure if ALL years and models use them though..or which years in particular..
Thanks guys I also found out that the 6.5 has shorter injectors so I bought two of them and had my 6.2's calibrated to spray like the 6.5's. I needed them for my 6.5 turbocharger installation.