1998 Vortec 350 Valve Guides - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-22-2008, 08:21 AM
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1998 Vortec 350 Valve Guides

On my 98 Silverado, about two months ago it broke. I tore it all apart and found that the #4 cylinder exhaust valve was stuck open, which hit the piston and split it in two. The truck had 150,000 miles on it so i replaced everything and put it back together and it runs fine. So I'm trying to figure out what caused this in the first place. I was reading on the internet that these engines are notorious for sticking exhaust valve guides when under stressful conditions. Is this true or is just because it was old?

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Old 06-24-2008, 09:53 AM
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just in luck

you got it I have raced un pro for quite a while and love the flow of these inexspensive heads. and i have had this problem twice and once was buildup from crappy gas deposits and the other was over reving. I floated the valves bending one and hit the piston so it could be hammer down or bad gas otherwise these heads seem pretty good
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Old 06-24-2008, 10:22 AM
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Well i was thinking that the timing chain was the culprit because it was original and had about an inch of play. You probably could of tooken it off without unbolting the timing gear. That probably was the last nail in the coffin and the valve hit the piston and got stuck.
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