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2002 Astro LT RWD
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37 Posts
I do not recall removing any heat shields to R&R my plugs. That being said, I definitely recall 3 or 4 different access points (interior/doghouse, wheelwell, underbody) in order to make it happen. It's really not that bad of a job. I'd do the Astro 4.3 plugs anyday over my Outback 3.6
 

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2002 Astro LT RWD
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37 Posts
Factory service manual states a 100k interval for the spec plugs (AC Delco 41932, appears to have been superseded by 41993).

Assuming the vehicle wasn't to the "run to fail" stage of it's existence, I really wouldn't go any longer than that.
 
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