Is that the valve knocking?

[Mopewbie]

The noise is getting louder, is that a valve issue?

Here's a slow motion video where one can see/hear it exactly when the #1 intake goes down. What do I need to do here?
Thanks.

 

[Xcudame]

I'd pull the intake and check out the camshaft lobe and lifter. Should be the third line from the front (first two lines are exhaust)

 

[HPP]

Wow, sounds like a knock and seems timed with the valve motion, but I've never heard a valve sound like that.

 

[Xcudame]

I wouldn't rule out #1 connecting rod bearing either! But start with the camshaft lobe and lifter first.

 

[Mopewbie]

Thanks all. I'll need to replace timing chain anyway, will go with the whole lot of cam/lifters/rods.
Might just do the rings as well.