I allready have the 90deg adapter, so if I could use it, it would be good.
The trouble is all the filters are about 3.6" in dia and won't quite fit.

I found these on summits web site, but they don't have an anti drain back valve. With the filter needing to be horizontal I would think it would need one.
I presume the anti drain back valve sops the filter from emptying if not verticle and the fitting surface at the top.
The K&N is very expensive as well.
http://www.summitracing.com/parts/pfs-1 ... /make/ford
http://www.summitracing.com/parts/sof-209-561b
http://www.summitracing.com/parts/knn-ss-2004
http://www.knfilters.com/oilfilter.htm
Any help appreciated.
The only concern is the by pass valve is from 11psi-17psi compared to the
8psi-11psi of the windsor filter. It does still open at the others upper limit.
http://www.summitracing.com/parts/knn-p ... /make/ford
http://www.summitracing.com/parts/knn-p ... /make/ford
I have had another look and there seems to be quite a variance in psi in different filters for the windsor anyway, so it won't matter.
Fram 22psi
motorcraft 11-14
morroso 20psi.
Looks like the way to go is to use the smaller dia filter and find a adapter fitting for the 90deg.
Unless someone can see a problem I can't
