Header Build for 212ci (little 6, super 6)

BigSky
BigSky Senior Contributor
in HUDSON

I’m working on building a header flange & ultimately a set of headers for my 37 Hudson’s original 212ci engine. Does anyone have original drawings that might show the center on center specs of the exhaust manifold/block studs &/or block ports?

Yesterday I CNC cut a 16 gauge steel test flange based off an old one piece gasket. After test fitting on a spare engine, doing some tweaking & taking more detailed measurements, it would really help to have factory measurements if at all possible.

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  • Glowplug
    Glowplug Expert Adviser

    I do not know if this will help, but the HET patents with drawings and measurements are online for many Hudson, Essex Terraplane products.

  • BigSky
    BigSky Senior Contributor

    Good suggestion, I always forget to look there… Thanks!

  • bob ward
    bob ward Senior Contributor

    You will get usable measurements using a digital vernier. The stud centres will most probably be on 1/16" increments, maybe 1/32".

  • terraplane8
    terraplane8 Senior Contributor

    Good stuff, what are your thoughts on primary pipe diameter and length, collector and exhaust pipe diameter?

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