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Old 08-31-2004, 08:09 PM
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rusty70f100
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The 391 has a lot more potential to be built up, due to it's relation to the FE series. IMO it'd take a LOT of work with a grinder and plenty of custom part $$$ to build up a 534 SD.

Stock, I dont know. I think the 534 had more hp and torque.