Hi, I had a GM 350 that would do that and a mechanic had me convinced it was a worn timing slapping against the cover and he was going to have to pull rad and everything off the front of engine to replace. I am lucky he didn't have time to work on it that week. I took it home and used the old broom stick method and found it was coming from the fuel pump. Remove fuel pump and the return spring was broken. I guess the fuel pump lever was not following the cam and at certain speeds was making the knocking noise.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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