I saw weld beads like that before on a Wilson Race manifold. It was 4 or 5 beads that all linked together. It was a work of art, it looked like snake skin.
That was like 10 years ago, and this day I still haven't seen anything like it.
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1969 Camaro LS2/T56 D1SC www.automotivedesigneng.com
Special thanks to: DPE Wheel / Columbia Parts Company / US Collision / T. Bruning