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For the 97 MY the block was cast thicker in certain places to assist with absorbing noise. I think the break was at engine #357*** and up. Although slight, I can definately hear the difference between my 97 and earlier trucks. If your truck is missing the factory underhood insulation, it will make a huge difference when installed.
Cheers.
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BigBopper
97 F-350 CC XLT 4X4 PSD, E4OD and a few other goodies...
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