2.25 turns lock to lock is correct for an IROC. The box you received could have been from a Z28. I have the IROC box in my 67 Firebird project. It was 2.25 turns when I checked it on my bench before installation.
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1967 Firebird project in the works
400, 670 heads, 2802 cam, Hooker comp, Crosswind intake, Quadrajet, 700r4, 3.42 Posi.
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