Quote:
Originally Posted by AZKen
Well you fooled me with that one, I guess my next guess is to guess..............................Rod Knock. There is an easy test for that. You may want to take off one plug boot at a time while motor running to see if it quits. That may not be possible if it's not knocking all the time. Anyway the test for rod knock is on YouTube. I think valve noise is a little more "ticky tacky" than your noise. Yours is a hard knock. But it is hard to tell from my house.
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I strongly second this.
I had a knock, it wasn't bad so I ignored it. At 55 mph the knock stopped, so did the truck. I had dropped a rod cap, the knocking was the piston slapping the head (had a nice imprint of the valves on it). BIG mistake to ignore any noise, or "get used to it" as I did.