it wouldn't be 6mm.
that's close to 1/4 inch.
if it's like the hole 1.9 waterboxers have in their throttle plate,
it's more like 2.5 or 3 mm.

looks normal to me in the picture,
not that I try to know very much about air-cooled vanagons.

----- Original Message -----
From: "zzyzx" <zzyzx9@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, July 04, 2010 10:56 PM
Subject: Butterfly in Throttle Valve Housing Part# 022 133 141B

> Is this part supposed to have the 6mm hole in it as highlighted by the
> arrow?
>
> http://zzyzx.org/butterfly.html
>
> Comments please.