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Sidepipe to header bolts, I have tried different combos and this is what I use everytime nowadays: 5/16" bolts, 1.5" long, grade 8, with flat washers. No antiseize, no splitlock washers, regular non-locking nuts. Zip them on with a small impact wrench and a 3' extension. If you ever remove them, throw them away and use new ones. They get brittle and oxidize heavily on the surface from all the heat. If a customer insisted on locking fasteners, I would use prevailing torque locknuts, the ones that look like they were smashed partway so the hole is more of an oval. Don't put a strong shearing load on them either, such as when the sidepipe is droopy and you are temped to put a jack under it and force it into position, this snaps them good.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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