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Ever find the source of the noise?

Is the original gas pump hooked up and working? This too runs off the cam and may be another source of the sound. On our truck, I have found that with everything properly adjusted and tight, the actual engine noises are quite low (at idle), except for the leaky middle exhaust manifold. Noise...

On our truck, the air governor makes a sound like a ticking lifter that has a similar cyclic noise. Try disconnecting the air compressor belt or something like that and run the engine up to temperature. You could also leave a valve open somewhere in the air system to load the compressor full...

Per the photos/pictures in Memphis' book and the TM, the lifters are like a B & S lawn mower engine, smaller stem and large base that rides on the cam. These have to rotate in order to distribute the wear over the entire face of the lifter, just like an older (60s through 80s V8). If one of...