Quote:
Originally Posted by bi11ymc
The only time I have heard of spark plug failures is after a header swap with the spark plugs in. Bump them during install and they can crack.
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I had a friend with a 94 Vette chase an issue for MONTHS that turned out to be a junk plug...but he didn't have headers on it, and they weren't AC Delco plugs by then either. Other than his car though...the ONLY time I've ever seen plug issues is like you said...if you bump one working on the exhaust manifolds/headers.
For what it's worth, at 30K my plugs all look great...I had them out sunday while I put my longtubes in...they looked perfectly fine, so I stuck them right back in the heads.