Gergo,
Exactly what nuts and bolts are you referring to?
On the 100's, all of the steel parts on the SU carburetors were a black
oxide finish. I believe the same was true for the BN4's with the exception
of the nuts that held the carbs to the manifolds, which would have been zinc
plated.
Curt
On Wed, Jan 19, 2011 at 11:00 AM, Austin Healey <pajtamuvek@gmail.com>wrote:
>
> I would like to ask how the original bolt and nuts were finished? They look
> like plain silver zinc
> plated, but later SU's usually have yellowish passivization.
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