Header update
As I write this, we are in possession of a prototype set of headers.
The fixtures had previously been rebuilt with poor results.
We are in the process of tweaking the fixtures,
and, as it turns out, tweaking the prototype set of headers as well.
Coincidentally, we currently have the #5 tube (front tube, left side) off
because it was not in the desired position.
This is the only tube near the oil filter.
As it turns out, the current prototype set has the most oil filter clearance of all the sets we have as a reference.
However, we have the opportunity to improve the clearance even more.
But the process is PAINFULLY slow and we have to draw the line somewhere.
My suggestion is, IF you plan/hope to use a short filter on the engine block with headers,
you should pre-fit to make sure there is clearance between the tube and the filter.
Past header batches (with the old fixtures) had the priority of clearance given to the motor mount area with the oil filter clearance a secondary concern.