If you really want to get an inspectable element filter with anti-drainback and a good micron rating (8) you might want to check out the Canton Racing spin on type filter with replaceable elements. I see they now offer a 3.4" size which is virtually the same size as the S&S filters.
https://www.cantonracingproducts.co...spin-on-3-4-inch-16-thread-2-5-8-o-ring/I've used the 4 1/4" housing version (same replaceable element) on several other cars for many years now (over 30 years on the Lotus!). Financially these really don't make sense as you still have to buy the replaceable elements ($11.99@PegasusAutoRacing.com) so there is no payback. What you do get is the ability to visually inspect the filter media and interior of the filter assembly at each oil change, which is why I use them.
Just checked, and I can't verify if these have anti-drainback valves or not. The 4 1/4" definitely do. I have an email into Canton to check on this.
