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It has 70 psi at 1000 rpms. The knock is intermittent and goes away with no warning. It could stop before pulling a plug. It does it for a few seconds while running and magically disappears?? I had about 32 degrees advance total to start out with. I now have 36 total. It runs better at 36...

Hoping someone can shed some light on this one... Got a new my newly rebuilt 440 running... 30 over, forged pistons, solid roller, ported stealth heads, RPM intake, Demon carb, high volumn pump and Harland sharps. When I first fired up the motor, it ran fine with no strange noises. I shut it off...