Some forms of stainless steel are also mildly magnetic.
From: Peter Ficklin <email@example.com>
To: Eric A. Yates <firstname.lastname@example.org>
Cc: email@example.com <firstname.lastname@example.org>
Date: 06 July, 2000 6:29 PM
Subject: Re: Headers
> Put a household magnet on your header... if it sticks, it's mild
>steel, if not then it's stainless, or plastic, or carbon fiber, etc.
>You get the picture. ;^) A magnet will also stick to cast iron...
>'63 & '68 Spits
>- - - - - -
>"Eric A. Yates" wrote:
>> Less than one month ago I installed a header on my '78 Spitfire and so
>> have had no trouble. It didn't really increase pickup by any noticeable
>> amount, but then again I am running the stock single ZS carb and the rest
>> the engine is stock (minus the emissions gear), so I didn't expect much
>> power increase.
>> One question: I acquired my header from a parts car so I don't know if it
>> stainless or mild steel. How can I determine this?