i`ve never decoded one where it says 4 bolt or not. i think you have to drop the pan to be sure. the #`s should be the same for both.
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85' SWB, 4.3/TH350, getting ready for paint
84`SWB, 462ci./TH400, cowl hood, 15" billet spec., flows, blazer buckets/console, flat black
71`SWB, project
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