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Tri-5 R&D is now offering Custom full length Headers for your 55, 56 and 57 Chevy. We have headers for the Stock steering, 605 Power Steering Conversion, Unisteer Rack & Pinion bolt on kits, and the newer power steering boxes introduced recently... Big Block, (502 and down), are made with 3/8 inch flanges, 14 gauge 2 inch primary tubes, (thicker than industry standard) and 3 inch Ball Style gasketless collectors.