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Hi Guys,
I changed out my AFM lifters several weeks back, which involved removing the heads. I took the opportunity to do a valve job with all new valves. Engine ran like new. I am now getting strange intermittent pinging/metallic sound on cold starts. Goes away completely after 5-6 minutes of idling/warming up. Used to be minor, but the weather is now below freezing and its much worse. I took a video, let me know if you can identify the sound. Something expanding as it warms up?
 

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That is not internal; but, your going to have to do a better job of locating the area.

After the engine overhaul, did you count all of your tools?
 
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