80K miles is my recommendation.
Though people run them longer than that..
and usually until something happens....like external leaks out of the
rubber outer gaskets,
coolant consumption through the combustion chambers, or combustion
getting into the coolant at the heads/head gaskets.

On 7/28/2013 10:31 AM, Scott Chapman wrote:
> I heard that once you rebuild an engine and do the heads on a 1985 Westy,
> you're going to have to do them about every 30,000 miles down the road.
>
> True/False/Comments?
>
> Thanks!
> Scott
>