Need help identifying pinging sound cylinder 3 Options

[nditiz1]

I recently adjusted my vales .06/.08 and also rebuilt my carbs. They were done separate and driven in between. I'm now noticing a pinging sound coming from the carb barrel on cylinder 3. If I put my hand over the carb throat it makes the sound go away. It is doing this at idle of ~950. I will load a video of the sound. What do you all think?

[nditiz1]

@rhodyguy

I originally had all seated. I then noticed #3 sync was not in line with #4. #3 needed the idle bypass to be adjusted out to bring it up to the level of #4 barrel.

Then, I redid everything with 1/2 turn out on all. Again #3 needed more to get it in sync with #4.

I am using the snail syncrometer. I have a uni-syn if that might be better.

I did just check the compression with a cold motor, plugs removed and at WOT. Here are the results:

Cyl 1 - 130
Cyl 2 - 138
Cyl 3 - 132
Cyl 4 - 138

Maybe I'm just paranoid and the sound in the engine bay coming from cly 3 is normal. I will double check my valve adjustments as well since the carbs and the valves were the only things I touched on this motor since purchasing the car.