Hoping to get some clarity on original Big Block GM 2-1/2"standard exhaust (Not N11's)I have researched the forum on this topic and there is much info, Yet, specifically with regard to the Mandrel bends did not see the area covered deeply. The JM states
65 JM says"consist of mild steel tubing with mandrel-bent curves. Inspect all exhaust systems for the presence of reduced - section areas or ridges in the bend areas."66 JM says"consists of mandrel-bent mild steel tubing w/ no reduced section areas or changes in diameter. Mild ridges may be present."
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