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The 8.1L was available on 8600+ GVW 3/4 and any 1-ton single- or dual-wheel through MY '07.
454 was last available in 1/2-pounders, iirc, 1990-1993, and only then in the SS454 CC10703 Short Box 2WD.
454s were unavailable in any 1/2-Ton from MY '80 thru '89. 8600 GVW and above was a magic ingredient, then.
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