Valve seals?

[6Burgh]

My '04 with 22,000 miles on it seems to blow smoke when I run it hard I just figured it was running rich but I noticed it had a puff of smoke when I started it up today. I am guessing it is the valve seals? I haven't beat or abuse the truck. I was just wondering if this is common for these motors or most engines it general?

[redvett]

Is it using oil? If not its just rich running.

[6Burgh]

Is it using oil? If not its just rich running.

 

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I never noticed it change on the dipstick. I just never noticed it smoking when I started it before but I usually dont look. LOL

[sgtschultz]

I've got an 03 with one valve seal going bad. Depends on the position of said valve at time of engine shutoff, whether oil will get down past the seal. So I have a 1 in 16 chance of getting the cloud at startup, and since I've been keeping track, its darn near about every 16 times I turn the key.

[ProSport Tim]

Hate to say it but Chevys' have been notorious for premature valve seal failure for eons. If it does it at startup it's a valve seal if it's hot and doing it, it's blow-by. I can't imagine blow-by @ 22,000 so I'd say valve seal. Black smoke is usually rich running, blue is oil, white is water/coolant.