These are AUD-135s - from 1965. My 67 BGT has the AUD-278s, also without
the ports. Most likely, the breather tube ports were introduced when the
PCV valve was eliminated, if I was to guess., maybe 68 or so.
David
At 09:26 PM 7/24/01 -0700, you wrote:
> Hi Dave,
>
> What's the # on your HS-4's? I have AUD-326s on my '69 and I have a
>set of 425s from a '70 (working from memory); all have the ports for the
>breather tubes.
>
> Cheers,
>
> CR
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