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Re: Big Block Engine Swap Question
You do not have to change the engine mounts in your '84 Jimmy. The engine mount brackets (clamshells) on the '98 454 should drop right onto the engine mounts that are in your '84 Jimmy. Although I would suggest installing new engine mounts. The frame brackets for the engine mounts in the '98 Suburban will not work in your '84 Jimmy. The frames are completely different. Actually now that I think about it, the engine mounts might be bolted directly to the crossmember on the '98 Suburban.
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