Here's the set up. 95 GT with a 306, GT-40 heads with all the bells and whistles, E-303 cam, 1.6 Roller Rockers, GT-40 Intake, 70mm Throttle Body, 75mm mass air. And a long list of other goodies. So here is the problem. I have a knocking noise in the engine that can be heard while the engine is running setting still. And is still only a low knock when I am driving casual, but any sort of rapid acceleration and the knock gets louder and harder. I have gone through the disconnection of each plug wire at a time to see if the noise went away and it didn't. I'm told that is a good thing because that would indicate that since the noise didn't go away it rules out a connecting rod or anything that is in the block. I then checked the clearance of the Rocker arms and retorqued them again, noise still remained. So then I replaced the lifters and yet the noise still remained. Then I got to thinking that the noise started after I ran the car out of gas. My thought now is injectors (24lbs). Could I have sucked something up in there to clog one up? I dont drive the car as much as I should and it sits for months at a time and I have treated my other stang a lot worse than I have ever treated this one, so how could it be anything but simple? I would appreciate any thoughts that anyone may have on this.