I've got a '57 3600. I believe with the original engine. Had a strange rattle/knock/tick when under high RPM, but not under all loading situations, or so it seemed. Hadn't looked into it, though perhaps I should have.
Driving along yesterday, I was accelerating and the accelerator got stuck down to the floor. Stuck to the carpet or something, revved very high when I was in neutral shifting to 4th, but it was just a second before I reached down and freed it.
Since then what sounds like it could be the same noise is much louder whenever rpms are increased much above idle.
I've pulled the valve cover, and the rocker arms and push rods seem to look fine. I pulled the oil pan. There was some debris at the bottom of the pan, very crumbly, though it looked rusty metal like. Spun the engine and couldn't see anything amiss. Nothing looks bent or damaged in a visual inspection.
With the engine spinning, it sounds like cylinder 6 is making a bit of a popping noise as the piston is heading up and a slightly different odd noise as it comes down. I'm afraid I don't know enough about what it could be, or where to look further.
I don't want to keep tearing things down without knowing what I can and can't rule out.
Thoughts/Suggestions from more experienced folks?
