Sounds like valve to me.
Listen to it under the car, it is usually easy to tell where noise is coming from. Feel the motor while it revs, use a screwdriver to listen, there are lots of tricks.
You can also pull the valve covers and check valve clearance. It takes an afternoon to do, but it is worth it to know what is going on with your motor.
Any work done recently?
Listen to it under the car, it is usually easy to tell where noise is coming from. Feel the motor while it revs, use a screwdriver to listen, there are lots of tricks.
You can also pull the valve covers and check valve clearance. It takes an afternoon to do, but it is worth it to know what is going on with your motor.
Any work done recently?