Running hot after partial coolant change

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Well, honestly I’ve never flattened a cam lobe before. The initial plan was to pull the cam and swap in a new one, new lifters and perhaps pushrods, oil change and call it good.
 
I really recommend you examine (and replace if needed) your rod and main bearings... there could be a lot of metallic crap that bypassed the filter. Also take the oil pump apart, it may be damaged/worn too.
Is it just one lobe so far?
 
Just one lobe. Had a lifter collapse, and I thought that was it. Upon pulling the intake I saw the cam lobe plain as day, right there staring at me. The engine is a fresh build, maybe 600 miles on it. 20 miles driven after first hearing the bad lifter.
 
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