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I'm driving on the freeway, car starts to squeal, smoke comes out of the breather, klunk, klunk, and starts running like crap. Pull it over, call a tow truck, and tear off the valve cover. One intake rocker on cylinder number three has been knocked off, with serious wear on the cam, and unbelievable wear on the rocker, in the process, it appears to have compressed the spring in such a way that a keeper flies off (thank god the other one held on), and proceeds to decapitate the number 3 exhaust lash adjuster. The two intake rockers on cylinder number 4 show significant wear and signs of heat, as do the cam lobes. The exhaust in cylinder 4 is fine, as are all the rest of the valves. I had 80 psi oil pressure, and when I removed the cam, all of the cam journals and lifter bores were wet with oil, so it doesn't appear it is an oil starvation issue. (at least up to the point where the exhaust lash adjuster was decapitated.) I pulled the head, and thank god the valves didn't hit the piston.
I'm struggling to find the root cause. The heads are essentially Livernois Stage 3 heads with bronze guides, stiff springs, and the large valves. the rockers and lash adjuster were new. The cam is a Comp Stage 1 Blower cam. What the heck caused this?
I'm struggling to find the root cause. The heads are essentially Livernois Stage 3 heads with bronze guides, stiff springs, and the large valves. the rockers and lash adjuster were new. The cam is a Comp Stage 1 Blower cam. What the heck caused this?


