[collins10672]

i have wondered about this too tim.there are several ways you probably could do this.you could put a hole in floor above the brace so you could take a water hose and wash it out later.to seal the hole you drill just put a small rubber plug like some of the newer vehicles have.or you could drill a hole in the backside of brace and put plug there so you could wash it out anytime you want to and the purpose of the plug would be to keep from more dirt filling it back up.there are two reasons that these trucks rusted so bad.one is poor workmanship from factory because of limited drain holes and also the cab was welded together before it was primered at the factory(that is why when you cut off rocker panels that they are so rusty behind them,also if you cut the roof skin loose and looked under there it would be surface rusted also)not trying to give these trucks a bad name because i love this body style and have owned 8 through the years,but the facts are gm didn't do a good job of rust proofing in the 60's.the second reason was plain and simple these trucks were driven on dirt roads,mud caking in the braces,salt,etc. and the owners were not to good at washing underneath.most farmers would just let the rain wash them off.gm didn't plan on these trucks being around 40 years later because if they built them too good they would quit selling new trucks later.i have thought long and hard about the drainage problems they have.i had a 66 that i restored in 1994 and put in new rockers,cab corners,inner rockers and fenders.i drilled drain hole in the bottom of fenders and washed it out ever time i washed the truck and never had a return of rust and the fender braces never packed up with dirt again.so the bottom line is drill drain hole every where you can because if you don't the truck will make its own drain holes(via rust holes).hope i have been some help.