There's another reason that you shouldn't use a bypass filter- the stock oil filter designed for the full flow 261 has a bypass relief valve in case the oil filter plugs up or can't flow enough when the oil is cold. This is not present in a bypass filter. Your engine will starve for oil when cold. There is no filter bypass built into the block. Modern engines with spin on filters either have a bypass built into the block or into the filter.


The nice thing about the full flow 261 is that the remote spin on kits for V8's work with no modification- just plumb the 1/2" NPT hoses right into the block. However, you need the ford version that has the bypass built into the filter.


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