Check your local metal scrapyard, pennies on the dollar and most high quality metals have some sort of printed labeling on them ( 2024T6 ect.).   David R. Cook RV6A Rotary, still waiting for irons to be finished, soon.
> On September 22, 2019 at 1:40 PM "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net> wrote:
>
>
> I found that the 1.25 OD, 0.035 wall 1.18" ID tubing I got are actually
> too small for the center (primary) engine block openings. Just barely
> big enough for the outside (secondary) runners.
>
> I've searched and searched, but cannot find 1.375" OD 0.035" wall alum
> tubing.
>
> Apparently it exists, because Charlie used it.
>
> Finn
>
>
> --
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