We're good at highjacing around here aren't we?

I agree we need to combine some knock sensor info and do some testing. You guys with conversions on AMC motors seem to have a great test bed as they are consistent in constant knock noise. Even if it's not high teck and try a 7.4L knock sensor, or the teflon tape, or the brass elbow, or both or all or? I got nothing that knocks... yet! I'll have to see how the IH does when done!

As far as OP we need to look at motor build, knock sensor tourque, any tapping of headers on anything, any thing tapping anything in that build, does he have open headers? Then try some of the tricks...