I have done searches and read many threads on this subject and I have noise which too me seems a bit excessive. My noise comes in about 2000 rpm and runs through 2500 rpm and then is gone again. It sounds like the rockers are not receiving oil in this rpm range. The car is my '72 road runner it has it's numbers matching 400 block in it with a 440 rotating assembly and is 451" 's, car also has a 4 speed so I easily get in this rpm range between shifts. The cam/lifter kit I put in is a Lunati voo doo #60303 with adv duration of 268 int./276 exh. and 0.494 int./0.513 exh.lift. The motor has the Edelbrock 88cc heads with the Edelbrock springs that are supposed to be good for .600 lift. I will say this is the best cam I have had in this motor (I have had a Comp hyd and a MP solid that worked terrible with the 4 speed)as it has awesome torque and pulls great with the 4 speed and 3.55 rear gears.
Somebody told me to switch in a set of the standard Comp #822 lifters would get rid of this as the Lunati lifters are staying pumped up in this range and making noise?
Any comments? Is this similar noise as some of you are experiencing?

I have played around from 3/4 turn, 1/2 turn and right now a quarter turn, when I initially set the 1/2 turn I had the intake off so I could be absolutely sure the cup was up against the lock. It makes the same noise and in the same rpm range in all of the above.

Yeah this is strange that it only acts up in that narrow rpm range. I wouldn't think it'd have a severe drop in psi just in that range. Does it sound like classic lifter clattering from low psi or a different arm/shaft noise or can you tell

Noise sounds like rocker arm clatter, oil pressure stays strong and if you hold it in that range for any length of time the noise stays the same. The oil looks clean as does the oil laying in the heads when the covers are off. I have tried different oils 20-50 originally and recently changed to 10-30 to see if that would change the noise, which it didn't. Oil pressure is high and this motor has no more then 500 miles on it since a complete rebuild, may go to a hydraulic roller if I can't figure this out, hate the thought of that expense this winter but would like to try and keep this cam if I can get it quieted down since it works so well, thing sounds like a diesel in that bad range.

I wonder if it could be as simple as a bad lifter(s) and breaking in a new set would be the ans? If so it'd sure be the cheapest way to go. Holler how it turns out & good luck

What kind of rockers are you running?

Due to ramp design on some of the new cam profiles there seems to be some 'noise' or periods of noise. If it runs good leave it alone.

..seems fast rate cams can be noisy

Some years back I had the MP .484 cam in a 340 Dart and it had the same noise. Never could find anything wrong and it ran great. Ron

I have exactly the same problem with a Crane in mine. It doesn't seem to noticably affect performance, just very annoying. Switched rockers from H.S. to Isky Iron. No difference. Tried all different preloads. No difference. Tried different length pushrods. No difference. Looked to see if rockers were hitting valve covers. Nope. Thought maybe what I really had was a header leak so I changed to Remflex gaskets. No difference. I give up. I'll put a solid in it before I try anything else. Then it will make less noise and have more power. Perfect.

Keith , how much valve spring pressure you running? Anything over 130# on a hydralic cam is excessive and can cause that.

The 60303 in my 440 has been clattering along for four summers without any issues. Noisy but pulls strong.

Guys! Its spark knock. This sound fooled me when I was a younger man. Try ta back off your timing, see if it changes.

If it does it when the car is not in gear, it is most likely not detonation as there is not enuf to load on the engine to generate the heat required. If you have a vacuum advance disconnect it and see if it then goes away.