Angle oil filter adapter

I use the PH43 size filter right on the block with headers, there is no clearance issues at all. If the fitting on the block was about 1/4" shorter I could get the PH8A size filter on.

I suppose you could argue that the smaller filter with less direction changes is going to be better overall for your engine than a bigger filter and adapter.

I have been toying with the idea of a remote filter so i could change the filter without getting oil all over the headers. I would be more inclined to go that way than use the 90 degree adapter.