Hairline crack in my hedder tube.
A simple 1 inch wide 1/8th inch thick strip of metal with a 90 degree bend at the top bolted up thru the floor board and the top hole of the header collector flange will support them provided your positive the motor is mounted solid. My Hooker fenderwells did the exact same thing exact same place on more than one tube so I had them TIG welded inside and outside all the way around, put the braces on and zero problems since but then again I have a 1/2 inch thick motor plate and an 1/8th inch thick mid plate with a solid mounted trans, aint nothing moving nowhere. Headers get the worst vibrations during a burn out and a two step launch. Cant wait to see what Hedman says.