Thread: 276 Desoto hemi exhaust manifold

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1/4 is to thin and only built few set in 1/4. but many times if you use 3/8 plate for header flanges the big tube in a car with narrow frame the tube bends will hang up on the flanges as you need fast bends and the in side bend hangs then you have to rework the flange for the radius of the bend . have had this happen more then one time with the 3/8 is fine has long has there cut and flat .on the smaller tube stuff is 060 wall and thats thick and on a out side bend it is ez the fuse weld it with a tig were the you weld kit bends can get very thin here less then .025. but most race guys do not want headers that are not a 100 pounds a set so there a trade off good u bends are hard to find some are junk. header gaskets i have had good luck with grafoil like the Mr gaskets . the copper will not blow out but they will not always seal less the headers are dead flat most all the time this is not the case the copper embossed can work better but i seen them leak if the bead will not set on the header flange if not line up on the o ring . lot of builder of headers weld o rings round the ports in hopes they seal better but it seams the copper just will not crush to leve out the poor work . some guys use red rtv on them as well .i built a set of headers for a B1 head mopar all he ever used was rtv ? but flanges were very flat