The Stovebolt Site Forums The Shop Area Engine Shop Full flow oil filter bypass pressure ?

I am doing the full flow filter conversion on my 235 engine and am stuck with which filter to use. I got a list today from Napa of the suitable filters for my remote mount base, and it shows many different filters with different bypass valve settings. 8-11 psi is the most common, is this Ok? I also have a choices of 7-9, 11-13, 12-15, 13-19, and 15-17. Help my brain hurts.
Thanks Jason

The bypass valve reacts to the pressure difference between input and output of the filter.
Lower ratings are safer in maintaining oil flow, if the media is clogged or during cold start with thicker oil viscosity grades.
Remember bypassing oil filters means dirty oil gets in between the bearings and journals.
A high efficiency quality filter like Napa gold doesn't really require a bypass valve.
But that is just what works for me and how I use and maintain my lubing system.
Most folks prefer the added safety of a bypass valve.

Thanks On the Road. I think I narrowed it down to the Napa Gold P/N 1515 it has the bypass set at 8-11 psi.
Thanks Jason

Jason, I ran a 1515 on my 235 (along with a cannister type by-pass filter) for approx. 140 K mi. When pulled for teardown it was reported to be very little wear & super clean. Was done as a story by the next owner in Classic Trucks mag. Was reported to still show the honing cross-hatch marks in the cyl. walls & the crank only needed polishing, not regrinding to be re-used.
I gave no thought to the by-pass press., I just always use that P/N due to it having a large filter area & being a very popular P/N for store stock. Using one on my current 292 motor in my '55.
Doug