Adam why are you interested in a bigger filter. Myself I'd be way more concerned about the highest efficiency filter I could get micron wise? Bigger may be better if the filter was say 99 + percent at say 10 microns because of dirt catching and possible flow issues.
Fram PH8a should work fine unless there is not enough room. Should the engine twist on it's mounts will a bigger filter hit anything? Will it be struck by road debris?
I use the bigger Fram Ultra XG8a on my van with a 3.3. I leave it on for 3 or 4 oil changes.
Adam why are you interested in a bigger filter. Myself I'd be way more concerned about the highest efficiency filter I could get micron wise? Bigger may be better if the filter was say 99 + percent at say 10 microns because of dirt catching and possible flow issues.
Not all FL-1a cross references are the same length. You might find one that's half an inch shorter that fits better, although you run the risk of it being an "economy" design.