Well after thinking about it our 351 clevelands in the early eighties used to run on when you turned the ignition off ( dieseling) and they did knock something terrible until they stopped but never seen a motor ping at idle.
Maybe I’m confusing it. There is definitely a sound there. I don’t really have a frame of reference for this except for when it pinged while I was driv8ng with an unlimited vacuum advance. It sounds like a hammer tapping on the exhaust pipe. It was for sure a ping. I’d never heard anything like it before. When I turn it off it just shuts down without any deiseling.
It doesn’t make sense if it is too advanced. I don’t think according to initial timing and idle....that it’s advanced enough.
The plugs have a darker brown color but look decent.
It’s also really choppy from off idle to exactly 2400rpm......then it smooths out. I gauge this by the interior parts shaking.
Also. The original problem that started this thread is mostly gone. Changing the jets back to stock 64 helped a lot with this while the car was warm. Changing over from a pink cam to the orange cam made the throttle instant and fixed that the car wanted to die ,but it stayed choppy and and this is throughout the transition. Like the transition is running lean. I don’t have the tools to adjust the ifr yet.
