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Thats part of the reason the guy I bought the truck from replaced the '69 cab with a '72. I sprayed the cowl and entire firewall with rubberized undercoating. I figure besides moisture protection it helps with some noise control also. Some guys don't like to do that to a firewall but its not an open -hood showtruck. Its better than a rusted out firewall. I also glued screen under the cowl openings.
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69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint
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