Quote:
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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...sorry... maybe adding salt to the wound...
I downloaded the pic and expanded it, the stem head of the adjacent valve appears to be hammered around...check the rubbing face of the rocker to see if it is hammered as well....this engine may have dropped a cam lobe which is what you felt as a "change in character at idle"...
When you initially started the engine from the rebuild, did you use a break in oil ?