Help with strange knock???

There have been some very bad issues with rubber products the last 5 or 10 years - problems with them deteriorating in a big hurry. Some people attribute it to cheap offshore stuff, but even moog and other "good" suppliers have had issues. The point is, don't rule things out such as bushings or engine mounts because they were new a year or two ago.

Feeling it through the steering wheel could be a header or the oil pan hitting on any part of the steering linkage - center link, idler or pitman arm, anywhere.

A few years ago, after having had my car together for 1 year I noticed a spot on my new, expensive TTI passenger side header that had been contacting the steering linkage. Upon closer inspection I found that the new (1 year old) spool engine mounts had both completely deteriorated and come apart allowing the engine to settle significantly enough to cause the interference.

Just food for thought - look at everything, even the "new" stuff.