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The three tube sizes most headers are actually built from, in both working angles. Six files. 1.66" (42.2mm), 1.75" (44.5mm) and 2.00" (50.8mm), each with a 9° and a 15° pie cut jig.
Why this set. One size is not a build. A real header needs at least two or three primary diameters and more than one cut angle — 15° for the long sweeps, 9° where the bend is tight or on show. Buying those one at a time costs more and you still end up short mid-job.
What you download
- Six STL files, ready to slice
- 1.66" 9° · 1.66" 15° · 1.75" 9° · 1.75" 15° · 2.00" 9° · 2.00" 15°
- 1D centreline radius geometry throughout
- A secure download link is emailed from goertz1.pro after payment. Nothing ships.
The maths
Six files bought singly is $90. This is $49. The physical tooling that covers the same three sizes starts at $260.
Suggested print settings
PLA+ or PETG, 0.2mm layers, 4 perimeters, 30% infill. PETG or ASA if the jig will sit near hot work.
Licence — Shop Use
Print as many copies as you like for use in your own shop, including on paying customer jobs. You may not share or resell the file, or print copies of the jig to sell. Print-and-sell licences available — ask.
Drawn by James Goertz, G1Pro. Building intake manifolds by hand since 2009 — hundreds of them.