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Hello, I have a 1969 mustang fastback that I built from the ground up and was finished about a year ago and there has always been this constant spark knock. I have messed with the timing in all different ways and it is currently at 6 degrees atdc. recently got a pertronix distributor put in. Today I changed the spark plugs and put in autolite copper plugs and new spark plug wires in and changed the coolant and also changed the oil and oil filter in hopes that something would change but of course it didnt. before the timing was at 10 degrees and that was terrible and its better at 6 but its definitely still there. im checking tomorrow for an exhaust leak but i doubt thats what it is because the knocking changes when the timing is changed. Any advice will be greatly appreciated I only have so much knowledge about this.
