ok brain trust at Commander club I got two motor craft FL-1A oil filters for my 1971 427s and the hole threads are to small. Are there two different oil filters for this motors. I threw out the old ones in the fall when I took the motors apart. Thanks guys
Yes, there or are two different sized filters. There was a switch from AC PF-2 before ser. no. #403169 and AC PF-24 after #403170
The AC PF-2 has 3/4-16 threads and an internal bypass valve
The AC PF-24 has 13/16-16 threads and no internal bypass valve
They are both the same OD but the PF-2 is 5.125in. height while the PF-24 is 4.5in.
You want something like the Fram PF11 or equivalent as the FL2 is no longer made.