VERY INTERESTING!!! I'm on an ALLMOST EXACT situation with a MORE LESS similar engine specs ( but stroked 400 3.75 ). Pings at around 4K RPMs or in the front to rear butterflies opening transition ( I think, or at least I think to feel it at gas pedal ), when giving gas because I'm requiring power going up a hill.

I'll be allert to this thread


With a Charger born in Chrysler assembly plant in Valencia, Venezuela