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Originally Posted by DeadheadNM
Had the original 350 in my 72 Blazer rebuilt under 600 miles ago by a reputable then local machine shop that's been in business for decades. Character of the idle abruptly changed and an accompanying ticking sound developed. Turns out a valve keeper sheared in half and there's a chip in the top of the corresponding valve.
Not sure why this failed. Whats the likely remedy? Pull the motor, yank the head, and replace the valve? I've got the Blazer at a good local mechanic where I now live. Trying to educate myself ahead of the upcoming "next step" discussion to getting back on the road.
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Man Pete, that sucks bad. Another possibility is the keepers weren’t seated all the way down in place on that one valve during assembly. I would think a good machine shop would have caught that as it’s quite obvious when they aren’t sitting right. I do agree with Aussie, I’d go over both sides with a fine tooth comb. Just for my own piece of mind on the cam I think I’d cut the oil filter open and see if you’ve got any metal. Good luck buddy!