I have a knock from my engine that sounded like it would knock with every revolution of the cam. With the stethoscope i listened to alot of different places on the engine. Noisiest on the fuel pump. I pulled the pump and installed a block off plate. Started the motor and the knock was gone. The fuel pump is a new Holley 110gph mechanical. 327-11 part number.Have any of you guys heard of a knocking fuel pump before? Are these pumps known to have problems? Is there a chance that the cam lobe that runs the pump is the problem? The cam is a XE274 which I have read some bad things about.