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Home | Cast Header Flanges

GM LT1/LT4 Flange

Cast Header as cast
  • Patented design (U.S. Patent US D700,554 S)
  • Feature aerospace derived engineering techniques and metallurgical processes
  • 316L Grade Stainless Steel delivers a very strong casting with heat and corrosion resistance
  • Flange rib design gives exceptional strength and reduced weight
  • A perfect match with Unique Headers 316L Stainless Steel cast tight radius header elbows
  • Runs cooler due to increased surface area, thus further reducing tendency to warp
  • Available in Miror Polished and Mill finishes

Mill/Cast Finish

Model Part Number Finish List Price
General Motors LS 104021 Mill $149.00 (set of 4)  
104023 Polished $225.00 (set of 4) View the flange

WARNING: This product can expose you to chemicals including Chromium (VI), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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Ultimate Headers are sold exclusively through performance and installer shops. For products, specs and where to buy click here.