loud buzzing noise

[CorrupTTalon]

well my engine noise has gone from a knock to a buzzing sound.

im about to pull my cams and check my lifter rollers, is it possible a few of them could be bad? has anyone experienced a buzzing noise coming from the Top end?

 

[CorrupTTalon]

update, i re checked my timing and took off all my accessory belts and started it up.. the buzzing if coming from the head for sure as i eliminated all accessories...

i have a video if anyone is interested.. the people that ive shown told me its a "new sound"